Bruce is expected to miss the entire Phillies series and will return to the team on Tuesday while Robles suffered a sprained knee in his last appearance on May 9.
Baumann, 30, was claimed off waivers from the San Diego Padres on April 27. He has allowed one earned run in 4.2 innings for the Las Vegas 51s since being claimed. In that span he has given up two hits, four walks and struck out four. He faced 11 lefties in his time for Vegas, he struck out eight of them and allowed only one hit.
He has pitched in only one major league game this season allowing two earned runs and getting one out. He had 6.2 scoreless innings in Triple-A for the Padres earlier this season with two hits allowed, five walks and nine strikeouts.
The former seventh round pick has a 3.58 ERA, 1.19 WHIP and 10.1 K/9 in 27.2 major league innings that spreads over three seasons for the Padres. Of note, in his brief major league career he has held lefties to a .163/.321/.256 slash line in 54 plate appearances.
Baumann will not be available tonight as he serves a one-game suspension for his role in the Rockies and Padres brawl last month.
Smith, 22, injured his quad running out a base hit in his first Grapefruit League at-bat this spring and did not make the Mets out of Spring Training.
He is currently slashing .278/.390/.417 with two home runs, twelve RBI, and eight doubles with Triple-A Las Vegas, playing first base.