MET NOTES Rickey Henderson was not activated from the disabled list yesterday because his sore right hamstring was not pronounced fully healthy. Henderson ran the bases during batting practice, working extra hard on going around second base.

Afterward Rickey spoke with Bobby Valentine and the two came to an agreement that they would wait at least 24 hours before activating the injured left fielder.

“He’s pushing it as much as he can push it,” Valentine said. “But he’s not quite 100 percent. He’d like to play and I appreciate that. But I think we’ll give it at least another day.”

Henderson has only played 20 games so far this season, hitting .258 in 66 at-bats and 21 walks. His on-base percentage is .437. *Robin Ventura’s first-inning grand slam was the 11th of his career, placing him fourth on the active players list. Harold Baines has 13, Mark McGwire and Ken Griffey Jr. each have 12 and Albert Belle and Ventura have 11. It was the second grand slam for the Mets this season. Brian McRae hit one May 1 in the Mets’ 9-4 win over the Giants.

Ventura has always been a very good hitter with the bases loaded. He came into the season 36-for-109 (.330) with 10 grand slams and 122 RBIs, but this year he has been even better, going 5-for-8 (.625) with a grand slam and eight RBIs. To date, he is 41-for-117 (.350) with 130 RBIs with the bases full. *Bobby Bonilla has graduated from a bulky brace on his right knee to a sleeve, which should give him a lot more mobility when he comes off the disabled list.

“It’s the best news I’ve had in two months,” he said.

The contusion on his left knee that forced him on the DL in the first place (he was hit by a Pedro Astacio pitch May 10. He said he expects to be able to play when he is eligible to come off the DL May 26. *Greg McMichael (shoulder) will throw a couple of simulated innings today and again on Monday and if all goes well, which it has so far, he will go on a minor league rehabilitation assignment next Wednesday or Thursday. He will probably go to Double-A Binghamton. *Mike Piazza took a wild pitch from Leiter that bounced in the dirt right up into Piazza’s throat. He was shaken up, but stayed in the game. Jim Abbott had his first sacrifice, a nicely placed bunt in the third inning.