When the Marlins open the second half of the season Friday night at Marlins Park against the Washington Nationals, the ninth inning will no longer belong to Heath Bell.

In fact, the closer’s job won’t belong to anybody.

Manager Ozzie Guillen, on his weekly appearance on the Dan Le Batard Show on 790 The Ticket on Tuesday, said he’s going to with a closer-by-committee approach until Bell — he hopes — regains his form.

“I’m going to go by committee, see who throws the ball better,” Guillen said. “I will talk to [Bell] when we come back from the All-Star break and explain to him why we’re going to do this. Hopefully, he’ll come back and start throwing the ball better and then he’ll go back to his role.

“I have to,” Guillen continued. “The players, club, the fans, myself, himself — it’s kind of hard dealing with this every other day.”

Bell (2-5, 6.75 ERA) has blown six saves this season — one more than he did all of last year in San Diego. But he also has had a handful of other situations where he has given up the lead and hasn’t been charged with a blown save because someone else inherited the opportunity or because the Marlins’ lead was more than three runs.

Guillen took the closer’s job from Bell temporarily back in May and gave right-handers Steve Cishek and Edward Mujica and left-hander Randy Choate a couple of opportunities to close out games.

Cishek and Juan Carlos Oviedo, who will complete his eight-week suspension on July 23, are the most likely candidates to replace Bell in the closer’s role. Mujica is expected off the disabled list (broken right pinkie toe) on Sunday and also could be in the mix.

Elsewhere

•  Unhappy Royals fans: Commissioner Bud Selig and union head Michael Weiner expressed disappointment that the Yankees’ Robinson Cano was booed repeatedly by fans at Monday’s Home Run Derby after bypassing Billy Butler of the hometown Kansas City Royals when selecting his team as AL captain.

“Robinson Cano certainly picked people he thought should be on there,” Selig said Tuesday. “While I understand Kansas City and I understand the whole Billy Butler thing, I really felt very badly [Monday] night.”

Said Weiner: “It struck me that it moved a little bit past traditional good-natured booing, particularly for an event like that.”

•  Mets: Right-hander Dillon Gee underwent surgery to remove a blood clot from an artery in his throwing shoulder, will miss his next start and will likely be put on the disabled list. Gee (6-7, 4.10 ERA) complained of numb fingers on his right hand Sunday, a day after he pitched.

•  Drug testing: Major League Baseball could start in-season testing for human growth hormone next year.

Each player was given a blood test for HGH during spring training as part of the labor contract that was agreed to in November, which allows blood testing during the offseason and spring training, and if there is reasonable cause.

Weiner said players will be discussing whether to expand testing to the regular season in 2013.

This report was supplemented with material from Miami Herald wire services.