A look at what’s happening all around the majors Saturday:

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WINNERS AT WRIGLEY

The Cubs can set a team record with their 57th home victory when they host the Cardinals at Wrigley Field. Jason Hammel (15-9, 3.56) is trying to prove himself worthy of a postseason rotation spot for the NL Central champs, though he hasn’t helped himself with a 6.87 ERA in three starts this month. Rookie Alex Reyes (3-1, 1.03) gets his fourth start for St. Louis riding a scoreless streak of 11 1/3 innings.

RICK’S ROLL

Rick Porcello (21-4, 3.08) can become baseball’s second 22-game winner in the past five years when Boston plays at Tampa Bay. Jake Arrieta won 22 games while earning the NL Cy Young Award last season, making him baseball’s biggest winner since Justin Verlander won 24 times with Detroit in 2011. Porcello likely only has two starts left, so Verlander’s mark is out of reach, but that win total combined with his late-season dominance — he’s 7-2 with a 2.38 ERA since Aug. 1 — could give him an edge in the AL Cy Young race.

BUILDING UP

Clayton Kershaw (11-3, 1.73) tries to stretch out even more before the postseason when the Dodgers face the Rockies. Kershaw was limited to 66 and 64 pitches in his first two starts after returning from the disabled list, then jumped up to 88 pitches in a 2-1 win over the Giants in his last start. Despite missing more than two months, Kershaw (6.1) entered Friday trailing only Jose Fernandez (6.2) in wins above replacement, per Fangraphs .

RIGHT THAT RANGER

The Rangers hope to get Yu Darvish on track in a game against Oakland before beginning what they hope is a deep postseason run. Darvish (5-5, 3.81) has a 7.47 ERA in his past three starts, including when he allowed seven runs over five innings last time out against the A’s. Darvish is stumbling at the end of a season that included his successful return from Tommy John surgery, though Texas is just 8-7 this season with their Japanese ace on the mound.

SEARAGE’S LATEST STAR

Ivan Nova starts vs. Washington looking like yet another success story for Pirates pitching coach Ray Searage. After going 7-6 with a 4.90 ERA with the Yankees this season, Nova is 5-1 with a 2.93 ERA in nine starts with the Pirates following a trade Aug. 1. Nova has just three walks in 55 1/3 innings with Pittsburgh, helping him produce a video game-like 15.00 strikeout-to-walk ratio.

GIANT STRUGGLES

Madison Bumgarner (14-9, 2.57) leads San Francisco against the pesky Padres, who had beaten the Giants six straight times before losing 2-1 on Thursday night. Bumgarner is coming off a dominant start against the Dodgers, when he threw seven scoreless innings of one-hit ball in a 2-1 loss. In his six starts previous to that one, Bumgarner had struggled to a 5.30 ERA.

NEW YORK (AP) — Stocks that moved substantially or traded heavily Friday:

Yahoo Inc., down $1.35 to $42.80

The company said hackers stole information from at least 500 million accounts.

Facebook Inc., down $2.12 to $127.96

The social network apologized to advertisers for what it calls an error that overstated the average length of time users watched videos on its site.

Endo International PLC, up $3.13 to $23.39

Endo named Paul Campanelli, the head of its generic drug unit, as its new CEO, replacing Rajiv De Silva.

Oshkosh Corp., down $6.02 to $50.88

The heavy vehicle manufacturer raised its current-year forecasts, but investors were disappointed with its projections for the next fiscal year.

Houghton Mifflin Harcourt Co., down $1.63 to $13.26

The book publisher said CEO Linda Zecher resigned.

AAR Corp., up 65 cents to $29.66

The airplane maintenance company reported quarterly results that were stronger than analysts expected.

Oracle Corp., down 28 cents to $39.23

After big gains recently, technology stocks pulled the market lower on Friday.

Kinder Morgan Inc., down 17 cents to $21.94

Energy companies including the pipeline operator rose as oil prices moved higher.

NEW YORK (AP) — U.S. stock indexes closed moderately lower on Friday following three days of gains. Several technology stocks traded heavily, including Yahoo, Twitter and Facebook. Energy stocks fell along with a steep decline in the price of oil.

The Dow Jones industrial average lost 131.01 points, or 0.7 percent, to 18,261.45. The Standard & Poor’s 500 index lost 12.49 points, or 0.6 percent, to 2,164.69 and the Nasdaq composite index lost 33.78, or 0.6 percent, to 5,305.75.

Stocks posted solid gains this week, with the S&P 500 up 1.2 percent, as investors were relieved that the Federal Reserve decided to keep rates at their current low level. The next time the Fed could raise rates is November, but the general impression among investors is the central bank will not raise rates until December, long after the general election.

“As much as market fundamentals matter, the Fed and its decisions continue to dominate markets,” said Kristina Hooper, head of U.S. investment strategies at Allianz Global Investors.

Several technology stocks made big moves as investors worked through company-specific news on Facebook, Twitter and Yahoo.

Facebook fell $2.12, or 1.6 percent, to $127.96 after The Wall Street Journal reported that the company was overstating how long users were watching video ads, raising concerns that a portion of Facebook’s ad revenue may be at risk.

Yahoo fell $1.35, or 3.1 percent, to $42.80 after the company admitted the data of 500 million users was stolen by a foreign agent, much more than it previously acknowledged. While Yahoo has previously agreed to sell most of its assets to Verizon, there were concerns that this development may cause Verizon to go back to the negotiation table.

Twitter soared $3.99, or 21 percent, to $22.62 after business network CNBC reported that the company is in deal talks with Salesforce and Google’s parent company Alphabet for a possible sale.

While stocks rose solidly this week, most of the gains were in relatively safe, dividend-rich companies that investors favor when they’re uncertain about the economy. The Dow Jones utility index was up 3.3 percent this week, and the newly created real estate component of the S&P 500, made up of mostly real estate investment trusts, rose 4.3 percent.

Oil prices fell sharply after reports that Saudi Arabia was unable to reach an agreement with Iran to cut production. U.S. benchmark crude oil futures closed down $1.84 to $44.48 a barrel on the New York Mercantile Exchange. Brent crude, used to price international oils, fell $1.76 to $45.89 a barrel.

In other energy trading, heating oil fell 5 cents to $1.41 per gallon, wholesale gasoline fell 2 cents to $1.38 a gallon and natural gas fell 3.5 cents to $2.955 per thousand cubic feet.

Energy companies were hit hard on the reports, and the energy component of the S&P 500 lost 1.3 percent, much more than the broader market. Transocean, the ocean rig operator, fell 55 cents, or 6 percent, to $9.10.

In metals, gold fell $3.00 to $1,341.70 an ounce, silver fell 29 cents to $19.81 an ounce and copper rose less than 1 cent to $2.201 a pound.

The yield on the U.S. Treasury 10-year note was little changed at 1.62 percent. The euro rose to $1.1231 from $1.204 and the dollar edged up to 101.09 yen from 100.89 yen.

SAN FRANCISCO (AP) — Facebook is apologizing to advertisers for what it calls an error that overstated the average length of time users watched videos on the site.

The measurement didn’t affect how much Facebook charges to run video spots, but analysts say ad agencies may have used the Facebook estimates as a key metric when they plan campaigns and decide how much advertising to place on Facebook or competing sites.

Facebook executive David Fischer said his company recently discovered its method of calculating the average viewing time didn’t include times when people watched a video for less than three seconds. That had the effect of making average times seem longer.

Fischer said Facebook has corrected the error, but analysts say it underscores the need for independent verification of such advertising metrics.

KNOXVILLE, Tenn. (AP) — A federal judge has ordered Tennessee to pay $100,000 in damages to a Muslim state trooper fired after a military liaison falsely accused him of terrorist sympathies.

The Knoxville News Sentinel reports (http://bit.ly/2cZcWB9 ) U.S. District Judge Tena Campbell issued the order this week.

Last year, Campbell ruled the Tennessee Department of Safety and Homeland Security discriminated against De’Ossie Dingus because of his religion. Campbell said testimony showed Dingus had been a target of religious discrimination from the start of his career as a Tennessee trooper in 2000.

Campbell initially awarded Dingus a symbolic $1 in damages, chiefly because Dingus didn’t seek counseling or other psychological treatment. To receive damages, a plaintiff must show discrimination caused emotional distress.

Then a federal appeals court in April declared the award “wholly inadequate,” saying the emotional harm Dingus suffered was “egregious” and obvious.

The ruling led Campbell to reconsider damages and award a higher amount.

“He was treated as a threat,” Campbell wrote in her order. “He was labeled as a possible terrorist-in-the-making. He was subjected to humiliating circumstances. All because he is a Sunni Muslim.”

Dingus previously won a separate civil service hearing awarding him back pay and benefits and agreed to take early retirement.

According to court records, a military liaison called Dingus a potential terrorist in 2009 after Dingus complained about a video on the radicalization of children shown during a class that was supposed to teach troopers how to recognize weapons of mass destruction. The liaison said Dingus was disruptive and belligerent during the class and confrontational afterward, but none of the 35 other troopers in the training class backed up the claim.

Even so, Dingus was fired in 2010.

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Information from: Knoxville News Sentinel, http://www.knoxnews.com

CAPE CANAVERAL, Fla. (AP) — SpaceX said Friday that evidence points to a large breach in the rocket’s helium system during a routine prelaunch test that turned into a devastating fireball three weeks ago.

The Falcon rocket and a satellite were destroyed in the Sept. 1 explosion, which occurred on the pad two days before the scheduled liftoff. Most of the wreckage has been recovered and is being analyzed.

In an update Friday, SpaceX said it’s still poring through video, audio and data from the moment the first sign of a problem occurs, until the actual fireball. That timeline covers less than one-tenth of one second. The data and debris indicate “a large breach” in the helium system of the second-stage liquid oxygen tank.

“All plausible causes are being tracked,” the company said on its website. There is no connection, the company stressed, with last year’s failed launch. That Falcon 9 rocket was enroute to the International Space Station with supplies when it ruptured a few minutes into flight.

In that case, a support strut for a helium bottle apparently snapped in the second-stage oxygen tank, dooming the rocket. Helium is part of the pressurization system.

While the launch pad was damaged, nearby support buildings and fuel tanks were unscathed, according to the company. The control systems at the pad are also in decent condition. No debris appears to have strayed beyond the SpaceX-leased Launch Complex 40 at Cape Canaveral Air Force Station. Ground crews had been fueling the Falcon for a brief test-firing of the rocket’s engines; the launch pad was clear of workers for the test.

SpaceX continues to work on another pad, this one at neighboring Kennedy Space Center and once used to launch shuttles. It could be ready to support Falcon launches as early as November, depending on how the investigation goes. It is also preparing a launch pad in California.

Launches will resume “as quickly as responsible” once the cause of the accident is pinpointed, the company said.

SpaceX chief Elon Musk has called this the most difficult and complex failure in the private company’s 14-year history. Meanwhile, he is scheduled to address the International Astronautical Congress in Mexico on Tuesday, presenting his ideas for colonizing Mars and making humans an interplanetary species — his overriding ambition.

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Online:

SpaceX: http://www.spacex.com/