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9/12/2013 9:39 P.M. ET

Giants reinstate Affeldt off disabled list

LOS ANGELES -- The Giants officially reinstated left-hander Jeremy Affeldt from the 15-day disabled list on Thursday, expanding their pitching staff to 18.

The Giants put Affeldt to the test in the 10th inning of Thursday night's 3-2 loss to the Dodgers. Affeldt allowed two singles, including Adrian Gonzalez's walk-off base hit to drive in Carl Crawford.

Manager Bruce Bochy indicated that Affeldt, who was shelved with a strained left groin, probably wouldn't initially pitch in the stressful situations he's accustomed to handling. However, he was placed in a big spot Thursday as the Giants were running out of options.

Affeldt pitched 10 1/3 scoreless innings spanning 10 appearances last postseason, which helped earn him a three-year, $18 million contract extension beginning this year. He was 0-3 with a 5.93 ERA and 0-for-3 in save opportunities in 16 games before being sidelined. Overall this year, Affeldt was 1-4 with a 3.51 ERA in 38 appearances.

Gaudin to throw simulated game Friday

LOS ANGELES -- Giants right-hander Chad Gaudin will throw another simulated game Friday in an attempt to be reinstated from the disabled list in time to pitch again this season.

"Hopefully, all goes well and we'd be able to activate him a couple of days after that," manager Bruce Bochy said.

Gaudin threw the equivalent of two innings in a simulated game Monday, but the Giants' decision-makers determined that he needed to sharpen his pitching repertoire further.

Gaudin, recovering from carpal tunnel syndrome, excelled in both the bullpen and in the starting rotation before being sidelined. He made his first 18 appearances in relief, recording a 2.05 ERA. Gaudin then replaced right-hander Ryan Vogelsong in the rotation and posted a 5-1 record with a 3.53 ERA in 12 starts. But Gaudin's physical unraveling was apparent in his final outing before he was sidelined, when he yielded eight runs and 11 hits in four innings on Aug. 16 at Miami.

Bumgarner's WHIP puts him in rare company

LOS ANGELES -- Madison Bumgarner has progressed to the point where he's being linked to a Hall of Famer.

Bumgarner enters his Friday start against the Dodgers with a 1.030 WHIP (average walks and hits per inning). That happens to be the lowest by a Giants left-hander qualifying for the ERA title (minimum: 162 innings) since Carl Hubbell, who's enshrined in Cooperstown, led the National League with a 0.982 WHIP in 1933.

Bumgarner also approached Hubbell last season, posting a 1.114 WHIP while finishing 16-11 with a 3.37 ERA. The only other San Francisco-era Giants pitcher to challenge Hubbell in WHIP was Atlee Hammaker, who had a league-best 1.039 figure in 1983.

You can win a trivia contest by naming who currently owns the third-best WHIP by a San Francisco left-hander: John Cumberland, who checked in at 1.124 in 1971.

Somewhat surprisingly, Mike McCormick's 1967 Cy Young Award season for the Giants (22-10, 2.85 ERA) produced a solid, but not remarkable 1.147 WHIP. Johnny Antonelli actually had a better WHIP (1.145) during a 19-10 season in 1959.

Chris Haft is a reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.