Eovaldi lasted just four innings while losing his fourth straight game and the Marlins lost for the ninth time in 13 games, 9-7 to the streaking Philadelphia Phillies on Tuesday night.
"We didn't pitch well tonight and we continue to leave people in scoring position," Marlins manager Ozzie Guillen said. "The easy RBIs, we can't get them in when we need them."
Acquired from the Dodgers in the trade for Hanley Ramirez on July 25, Eovaldi dropped to 3-6 with a 5.44 ERA in nine starts with the Marlins.
"I fell behind in counts and was missing with my fastball," Eovaldi said. "Overall, not a good outing."
Said Guillen, "He's only (22 years old). It's a learning process right now but you've got to learn to throw strikes."
The Marlins made a costly error in the sixth inning when catcher Rob Brantly dropped Jimmy Rollins' routine popup behind the plate. Rollins followed the error by blasting reliever Chris Hatcher's next pitch deep in the seats in right to give Philadelphia an 8-3 lead.
"Errors are out there," Guillen said. "Unfortunately the next pitch was a homer and the rally started. It's too bad it happened. We fought back. We had the right guys at the plate but we couldn't finish it off."
Giancarlo Stanton homered for Miami. Stanton went deep for the 14th time in his last 17 road games to up his league-leading road total to 21 homers.
Rollins homered and drove in three runs and Roy Halladay won again as the Phillies won their sixth straight game.
Despite allowing five runs and seven hits in 6 1-3 innings, Halladay (10-7) improved to 4-0 in his last five starts. The right-hander walked three and struck out six.
Juan Pierre and Chase Utley both had three hits for Philadelphia, which finished with 15 hits while winning its 14th in the last 18 games. The five-time defending NL East champion Phillies, who reached .500 for the first time since June 4, are making a late playoff push. They began the day five games behind St. Louis in the NL wild-card race.
"Things have been going our way good," Phillies manager Charlie Manuel said.
That was apparent in the sixth inning.
"There are times we got breaks (this season) and weren't able to take advantage of it," Rollins said. "This time we were. It's more than that, though. We're executing, playing good defense, and getting good pitching and timely hitting. We know we needed to clean it up in many areas."
a smiling Rollins acknowledged the excitement in the Philadelphia clubhouse.
"You hear it's a cliché that this is what you play for, for September, but it's true," he said. "We have a lot of flags but we don't have a wild-card flag, so this would be a good time."
Jonathan Papelbon pitched a scoreless ninth for his 33rd save in 37 chances. He was the last of 12 pitchers used in the game, with each team sending six to the mound.
The Phillies jumped in front 3-0 in the first inning, highlighted by RBI singles from Carlos Ruiz and Domonic Brown.
Miami closed within 3-2 in the third on an RBI single by Justin Ruggiano and sacrifice fly by Jose Reyes
Philadelphia got a run back in the bottom of the frame on Utley's RBI single, and then took a 5-2 lead in the fifth on Pierre's RBI single off Eovaldi (4-12), who gave up five runs and eight hits.
Stanton launched Halladay's first pitch of the sixth inning deep into the seats in left to bring the Marlins within 5-3. It was Stanton's 34th homer, tying his career-high set last season.
Halladay got that run back himself in the bottom of the frame, lining a single up the middle off Chris Hatcher to drive in Michael Martinez who had doubled. It was the second RBI of the season for the light-hitting Halladay, who entered batting .152.
And Rollins followed by blasting a two-run homer to right.
"That looked to be plenty of runs for the Phillies, but the Marlins scored four runs against four Philadelphia pitchers in the seventh.
Halladay left after facing three batters, the last Bryan Petersen, who doubled home Brantly.
"The last two months have been a lot better," Halladay said of the team's play. "We have seen a lot of good things and we just want to keep it going."
After giving up an RBI single to Justin Ruggiano, it looked as if reliever Josh Lindblom was going to end the inning but second baseman Utley had a sure double-play grounder go through his legs to extend the inning. The Marlins scored two more on RBI singles by Carlos Lee and Greg Dobbs, to get within 8-7.
Rollins' sacrifice fly in the bottom of the seventh scored John Mayberry Jr., who had doubled, and put Philadelphia ahead 9-7. The Phillies left the bases loaded when Ryan Howard flied out to center for the final out.
Notes: Ruiz, having a career year, was back in the starting lineup for the first time since Aug. 2. He was on the DL from Aug. 3 through last Friday with a left foot injury. . Christopher Suprun, a paramedic and firefighter who was a first responder to the 9/11 attacks of the Pentagon, threw out the first pitch. Suprun was one of many military, fire and police personnel recognized by the Phillies on the evening. . Dobbs went 1 for 3 against Halladay and is batting .533 (8 for 15) against Halladay. . Miami RHP Josh Johnson (8-11, 3.81) is scheduled to face Phillies LHP Cliff Lee (4-7, 3.50) is the finale of the three-game set at 4:05 Wednesday.