Lucas Duda told Mets officials he felt "just about 100 percent" after going 1-for-3 in his rehab debut Friday night for Class A St. Lucie, according to general manager Sandy Alderson, furthering the team's optimism that he can come off the disabled list when eligible on Monday. The Mets want to see Duda amass significant at-bats this weekend, and they could still push his timetable back a day or two. But if Duda does not return Monday from the hyperextended left elbow that has sidelined him since April 19, he should do so shortly thereafter. Considering all their other injured players, the Mets could use him. With Yoenis Cespedes nursing a strained left hamstring, Jay Bruce slid from first base back to the outfield for Friday's series opener in Washington. That opened a hole at first, where T.J. Rivera started his second straight game on Saturday. Rivera should continue to start at first base until Duda returns.