It’s about time.For the first time this spring, Pedro Martinez answered the question with a specific date – Sunday against Baltimore. That’s when he will pitch in his first exhibition game. Then, a week from Friday he’ll pitch in another. The math says no to Opening Day. “Opening Day? No,’’ Martinez said. “But, maybe one of the games at home.’’ Tom Glavine, of course, will get the Opening Day start. If you’ve been paying attention, I’ve been telling you for weeks now Martinez wouldn’t start. I’m not even sure about the first week. Why rush it? Let him stay in Florida and throw in a couple of minor league games, then bring him back. There’s nothing to be gained but an injury in rushing him. Around the Horn: Carlos Beltran was sent home tonight with flu-like symptoms. … Billy Wagner claims not be be concerned with his injured finger on his pitching hand. He has been shut down until the weekend but said he would be ready Opening Day. … Steve Trachsel said he felt good after working in a minor league game. The Mets had Trachsel work in the morning and saved Aaron Heilman for tonight as another measuring stick to determine the fifth starter. Actually, if Martinez opens the season on the disabled list, it will be a moot point.