Alfonzo, coming off his best performance of the season, looks to keep his former team winless at Pacific Bell Park as the Giants resume a four-game series with the struggling Mets.
San Francisco had dropped five straight games before New York came to town, but won its second straight after Alfonzo homered and drove in four runs in Friday’s 7-5 victory.
Alfonzo hit .308 with 16 homers and 56 RBIs for the Mets last season, but was not re-signed.
“The Mets had offered me nothing, and that was kind of disappointing,” he said. “But there was somebody else that wanted my service. I never expected to come to San Francisco.”
Alfonzo started the season slowly, but has been seeing the ball well lately, raising his average from .181 to .245 since May 1. He is 8-for-18 with seven RBIs in his last four games.
Making matters worse, All-Star catcher Mike Piazza had to be carried off the field in the first inning of Friday’s game with a strained right groin after trying to avoid an inside pitch from Jason Schmidt.
X-rays were inconclusive, but Piazza was placed on the 15-day disabled list.
Piazza, batting .522 (12-for-23) with four home runs and nine RBIs in his previous six games, jumped out of the way of a 2-2 pitch, then fell to the ground. He needed help walking off the field.
Examined by Giants doctor Ken Akuzuki, Piazza reported feeling a pop in his groin and a lot of pain initially.
Piazza will undergo an MRI exam Saturday. He joins seven teammates on the disabled list. Shortstop Rey Sanchez went down Wednesday with a sprained left thumb.
“It’s just another setback physically,” Howe said. “It’s a reason we have him taking groundballs at first. Catching is a demanding position.”
STANDINGS: Mets - 5th place, 12 GB, NL East. Giants - 1st place, NL West.
METS PROBABLE STARTER: Steve Trachsel (1-2, 5.09 ERA). It took the veteran right-hander 11 starts to get his first victory of the season. He allowed four runs and four hits over six innings in a 9-6 victory at Colorado on Tuesday. Trachsel is 5-3 with a 2.79 ERA in 14 career starts against the Giants.
GIANTS PROBABLE STARTER: Damian Moss (5-1, 2.37 ERA). The left-hander is coming off his first defeat of the season. He allowed three runs and six hits over 6 1-3 innings in a 4-3 loss to Montreal on Monday. Moss is 0-0 with a 6.60 ERA in four career appearances, including three starts, against the Mets.
OFFENSIVE LEADERS: Mets - Piazza, .333 avg. and 7 HRs; Cliff Floyd, 22 RBIs; Roberto Alomar, 23 runs and 5 SBs. Giants - Andres Galarraga, .388 avg.; Barry Bonds, 11 HRs; Jose Cruz, 24 RBIs and 32 runs; Ray Durham, 5 SBs.
SEASON SERIES: Giants, 2-0.
STREAKS AND NOTES: Mets - Left-handed batters are hitting just .205 against RHP Trachsel. … C Jason Phillips was recalled from Triple-A Norfolk to replace Piazza, and is expected to arrive in time for Saturday’s game. Phillips was batting .360 with four home runs and 20 RBIs with the Tides. … OF Floyd went 2-for-4 against LHP Moss last season, both hits were solo home runs. Giants - 3B Alfonzo is hitting .500 (7-for-14) with a home run and two RBIs in his career against RHP Trachsel. … OF Marquis Grissom is hitting just .276 (8-for-29) in his career against RHP Trachsel, but owns team-best totals of two home runs and four RBIs against the veteran right-hander. … 1B J.T. Snow hit his third triple of the year in the fourth inning of Friday’s win, establishing a career high. He has 16 career triples.
ROAD/HOME RECORDS: Mets - 6-15 on the road; Giants - 12-8 at home.
INJURIES: Mets - SS Sanchez (thumb), 15-day DL; 1B Mo Vaughn (knee), 15-day DL; OF Jeromy Burnitz (hand), 15-day DL; RHP David Cone (hip), 15-day DL; LHP John Franco (elbow), 15-day DL; RHP Scott Strickland (groin), 15-day DL; RHP Grant Roberts (shoulder), 60-day DL. Giants - 2B Ray Durham (ankle), 15-day DL; OF Marvin Benard (knee), 15-day DL; LHP Jason Christiansen (elbow), 15-day DL; RHP Robb Nen (shoulder), 15-day DL.