This year the team hopes it will get to see how good he is in the regular season, too.
De Aza led off the game with a homer and drove in two runs as a Florida Marlins split squad beat the Washington Nationals 4-1 on Friday.
"He had a terrific spring last year and that's why he made the club out of spring training, and then he hurt himself and we didn't get to see what he was capable of," Marlins manager Fredi Gonzalez said. "This year he's coming in and making an impression. He's coming along and hopefully it comes down to a tough decision at the end of the spring."
The 23-year-old outfielder made the Marlins out of camp last season, but he broke his right ankle after nine games and missed four months.
De Aza hit a grand slam against the Orioles on Thursday and two hits and an RBI on Tuesday.
Ricky Nolasco started for the Marlins and pitched two scoreless innings, allowing three hits. Burke Badenhop worked two innings for the save.
"We walked just three guys, we were throwing strikes and when that happens the defense looks good," Gonzalez said.
Tyler Clippard started for the Nationals, allowing one run on two hits.
"My command is not where I want it to be yet," Clippard said. "I felt strong and made some quality pitches, but obviously there is still some work there to be done."
Mike Bascik, who was 5-8 with a 5.11 ERA in 29 appearances last season, gave up two runs on three hits in one inning for the Nationals.
"I threw four pitches and three guys were on," Bacsik said. "They weren't waiting to see what I had today ... It was one of those games."
For the Marlins, Mike Jacobs was 1-for-2 with a single and two walks, and Jeremy Hermida drove in a run with a sacrifice fly. Florida also scored a run on a wild pitch by Charlie Manning in the eighth inning.
Nationals outfielder Rob Mackowiak came out of the game in the sixth inning with weakness in his right abdomen after he rounded first base. Mackowiak reached on an error, but came up hurt after rounding first base. Mackowiak, who underwent offseason surgery for a double sports hernia, is day to day. ... Marlins outfielder Cameron Maybin left in the ninth inning with tightness in his left hamstring after reaching first on an error by shortstop Felipe Lopez. ... Both Nationals shortstops, Cristian Guzman and Lopez, committed an error.