New York (70-45) at Washington (51-65)

New York Mets center fielder Carlos Beltran has felt right at home this season at RFK Stadium.

He’ll try to help the Mets win another series when they conclude their three-game set with the Washington Nationals on Sunday.

Beltran had three hits and became the first player in the majors with 30 homers and 30 doubles this season as the Mets (70-45) beat the Nationals 6-4 on Saturday night for their sixth win in seven games. He also hit his first triple of the season and nearly hit for the cycle before grounding out in the ninth needing a homer.

Beltran is batting .444 (8-for-18) with two home runs and five RBIs in five games at RFK Stadium this season, and has at least one hit and one RBI in four of those contests.

He is a career .377 hitter at RFK Stadium, with 10 of his 23 hits going for extra bases.

Beltran’s had plenty of success against Tony Armas (7-8, 5.04 ERA), who starts for Washington (51-65) on Sunday. He is batting .455 (5-for-12) with a homer and three RBIs against the right-hander.

Carlos Delgado has been even better against Armas, who is struggling of late, going 7-for-12 with four homers and five RBIs. The first baseman, though, hasn’t hit a home run since July 30 against Atlanta and is 0-for-8 over his last three games.

Beltran had 38 homers and 36 doubles in the 2004 season, which he split between Kansas City and Houston. He has 33 homers this year and needs two RBIs to reach 100 for the sixth time in his career.

With Saturday’s victory, New York reached 70 wins in the third-fastest time in team history. Only the 1985 and 1986 teams got there quicker.

Steve Trachsel (11-5, 5.03) will try to help the Mets claim the series and win his third straight start when he takes the mound for New York on Sunday.

The veteran right-hander has gone 5 2-3 innings in his last two outings, allowing three runs to Florida on Aug. 2 and two runs to San Diego on Tuesday.

Trachsel has won nine of his last 10 decisions, and the Mets are 15-7 when he starts this season.

“He’s been pretty consistent, keeping us in the ballgame for the most part,” Mets manager Willie Randolph said. “He makes pitches when he has to.”

Trachsel is 10-5 with a 3.43 ERA in 25 career starts against the Nationals.

Armas will be looking to snap a three-game losing streak. He has lost five of his last six starts after beginning the season 6-3 with a 3.34 ERA.

After lasting less than four innings while giving up six runs in each of his two previous starts, Armas went six innings against Florida on Tuesday, but lost despite allowing four runs—two earned.

He had a high pitch count against the Marlins and has been consistently falling behind hitters during his slump.

“I don’t know what it comes from,” Nationals manager Frank Robinson said. “He knows it. He’s been made aware of it. I can’t—and (pitching coach) Randy (St. Claire) can’t—make him throw the ball over the plate.”

Armas lost to the Mets on April 12, and is 5-4 with a 3.31 ERA in 11 career starts against New York.