BALTIMORE — There is a clear favorite in the pending vote to determine who replaces longtime commissioner Bud Selig, but the coronation of Major League Baseball chief operating officer Rob Manfred is not a foregone conclusion.

Baseball owners and their representatives convened at the Hyatt Regency in Baltimore on Wednesday for meetings and presentations in advance of Thursday’s vote. They will resume discussions Thursday morning before attempting to choose one of the three finalists — Manfred, MLB vice president Tim Brosnan or Boston Red Sox chairman Tom Werner.

Selig, 80, has ruled baseball since September 1992.

Though the majority of owners are expected to vote for Manfred to be the sport’s 10th commissioner, there is a chance that the selection process could stretch beyond the second day of baseball’s quarterly owners meeting and force the seven-man search committee to reconsider the list of candidates.

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The new commissioner must receive a 75 percent super-majority to be elected, which means he must get a thumbs-up from 23 of the 30 teams. If that number is not reached, the owners will vote again until they consolidate behind one candidate or decide that any further vote would be futile.

Manfred was estimated to have the support of 20-21 teams headed into the meetings, Werner of about six and Brosnan one: the Cincinnati Reds.

“I wouldn’t even guess,” Los Angeles Angels owner Arte Moreno said.

Werner is supported by Chicago White Sox owner Jerry Reinsdorf and Moreno. Other teams have said Reinsdorf wants a commissioner who will take a harsher stance in labor negotiations for the deal to replace the collective-bargaining agreement that expires after the 2016 season.

“We’ve got three good candidates, so we’ll see,” said St. Louis Cardinals chairman Bill DeWitt, who chairs the selection committee. “I’m optimistic we’ll have a commissioner.”

San Francisco Giants president Larry Baer agreed, though no one was particularly committal.

“There were three good presentations … a lot of good stuff,” Baer said. “I would assume (someone will be elected). Why not? That’s what we’re here for.”

Notes

• The Colorado Rockies say All-Star shortstop Troy Tulowitzki will have surgery on his left hip Friday in Vail, Colo., and miss the rest of the season.

The team announced the news after their 5-3 loss to San Diego.

Tulowitzki, whose .340 batting average remains tops in the big leagues, was placed on the 15-day disabled list on July 22, three days after he was hurt running out a grounder at Pittsburgh.

Yu Darvish will miss at least a couple of starts for the Texas Rangers because of right elbow inflammation.

Texas placed its ace from Japan on the 15-day disabled list, a day before his scheduled start against Tampa Bay. He will have an MRI on Thursday.

The move was retroactive to Sunday, a day after Darvish allowed six runs and nine hits over four innings in a loss at Texas.

• Baltimore third baseman Manny Machado was placed on the 15-day disabled list with a sprained right knee ligament, an injury far less serious than originally feared.

Machado took an awkward swing in Monday’s game against the New York Yankees and crumpled in the batter’s box, clutching his knee. He had to be helped off the field and was provided a pair of crutches after the game.

An MRI on Tuesday revealed that the 2013 Gold Glove recipient has a sprained ligament.

•Washington right fielder Jayson Werth will remain sidelined for at least a couple of days after receiving a cortisone injection for his sore right shoulder.

Washington manager Matt Williams said Werth has a sprained AC joint, but an MRI showed no structural damage.