Daniel Murphy isn't sure whether he'll be ready for Opening Day as he continues to recover from offseason knee surgery. "I'm generally optimistic that when they put me in the lineup, I won't come out," Murphy said on Tuesday when asked about his chances of being ready for the Washington Nationals' season opener against the Cincinnati Reds on March 29th. "You see these guys bouncing around and playing, you want to participate and be playing with your teammates," said Murphy, who was the only position player not to participate in team drills on Tuesday, one day before the Nats' first official full-squad workout. "But I think it's the understanding of when they loose me, when the training staff lets me go and it's time to play, you only want to come off the DL once. I don't want to start playing games and then have to stop. So that's kind of the mindset we're taking right now." New manager Davey Martinez echoed the sentiments of his veteran second baseman. "I'm more concerned about rushing him and him not being fully ready," said Martinez. "When we get him back, we don't want him to go back on the DL, we want to get him back for the whole season." Murphy had debridement and microfracture surgery on his right knee in mid-October, shortly after Washington fell to the Chicago Cubs in the National League Division Series. More than four months later, he has regained full range-of-motion and is running at 60 percent weight-bearing on a treadmill, though he hasn't yet been cleared to take swings.