The Mets are expected today to introduce Pedro Martinez at a press grip-and-gin and present him with jersey No. 45, which he’ll try on over a suit as flashbulbs pop. Whether the Mets really ought to be fooling again with these kind of high-risk moves is debateable, but we have little doubt that Pedro will provide some excitement. His taking of No. 45 likely solidfies John Franco’s bid to be the first player in Met hstory to warm up a jersey number for two future Hall of Famers.