CHICAGO -- Jason Bay left Tuesday's game against the Cubs in the seventh inning with a stiff right calf, but neither he nor the Mets considered the injury serious. Bay expects to be in the starting lineup for Wednesday's game against the Cubs.

"It was really a non-issue," Bay said. "Really, it's as close to a non-issue as it can be."

Originally feeling tightness in his calf while shagging fly balls during batting practice, Bay alerted manager Terry Collins of his condition but asked to remain in the lineup. Once the Cubs took a six-run lead into the seventh inning, however, Collins removed Bay as a precaution, replacing him with Fernando Martinez.

"I don't want to call it a cramp, because when it's 20 degrees outside it's not a cramp," Collins said. "But he had a catch in his calf and he told me he wanted to play. When the game started to get out of control, I told him, 'You're done for tonight.'"

Temperatures at Wrigley Field sat in the mid- to low-40s all evening, with swirling winds adding to the effect.

Bay missed the first three weeks of this season with an oblique injury, after sitting out the final two months of last season following a concussion. He is hitting .227 with two home runs on the season.

Pagan expected to return to Mets on Friday

CHICAGO -- Barring a setback, outfielder Angel Pagan will rejoin the Mets in time for Friday's game against the Phillies. First baseman Ike Davis will not.

Pagan, rehabbing from a strained left oblique, went 1-for-3 with a double and two walks for Class A St. Lucie on Tuesday, playing all nine innings in his rehabilitation assignment.

He is scheduled to play for St. Lucie again on Wednesday, before advancing to Triple-A Buffalo the following day. The team plans to activate him thereafter.

"He should be with us on Friday assuming nothing else happens," general manager Sandy Alderson said.

Davis, recovering from a sprained left ankle, felt "good [Tuesday], not so good [Monday]," in the words of Alderson. He has begun to run and take part in baseball activities but has not made any lateral movements and will not come off the disabled list when eligible on Thursday. The Mets have no specific timetable for his return.

Wright on same timetable after seeing specialist

CHICAGO -- Mets third baseman David Wright returned to New York on Tuesday following an examination of his back by specialist Dr. Robert Watkins in California.

Wright and his doctors have developed a plan of rehab and physical therapy going forward, but the Mets have not updated their timetable for his return.

"There was nothing ... that changed anything in terms of his diagnosis or the expectations about him coming back," general manager Sandy Alderson said.

The original plan, which the Mets developed early last week, called for 10 days of rest followed by a reevaluation. Wright is not eligible to come off the disabled list until May 31.

Johan throws off mound for first time since 2010

CHICAGO -- Left-hander Johan Santana has begun throwing off a mound for the first time since undergoing left shoulder surgery last September.

Santana threw 25 times off a pitching rubber Monday at the team's Spring Training complex in Port St. Lucie, Fla., officially beginning the third and final phase of his three-pronged rehabilitation plan. Previously, Santana had only thrown off the front slope of the mound.

"I hesitate to say that we're on our way, but that was a good sign," general manager Sandy Alderson said.

The Mets have said that Santana will need six to eight weeks of additional rehab following his return to a mound, keeping him on pace for a return in late July.