Washington Nationals ace Stephen Strasburg is undefeated no more. 

While the right-hander struck out 10 and only walked one, he surrendered six runs over six innings in a home start against the Dodgers on Thursday. Justin Turner was responsible for nearly every run scored against Strasburg, who fell to 13-1 on the year with a 2.83 ERA.

Turner hammered two home runs and drove in five runs — all against Strasburg, whose only run support came on a Bryce Harper sacrifice fly in the first inning. The Dodgers used eight pitchers to finish the 6-3 victory and move to within four games of the Giants in the NL West. 

The Nationals will turn to Strasburg again on Wednesday in a potential World Series matchup with the Indians in Cleveland. 

Player of the day

David Ortiz, Red Sox — The veteran slugger is showing no signs of slowing in his final season. Big Papi, who hit a baseball so hard on Thursday that it got lodged in Pesky’s Pole during batting practice, went 3 for 4 with a homer and four RBIs against the Twins. The two-run blast in the Sox’s 13-2 win was Ortiz’s 527th career homer (19th all-time).  

Highlight

The 2015 World Series-winning Royals visit the White House to meet President Barack Obama and his administration.

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Three things to know

— Pirates left-hnder Francisco Liriano’s 13 strikeouts without a walk against the Brewers are the second-most by a Pirates pitcher in a game in the last 100 years (Jose DeLeon, 14).

— The Orioles avoided a sweep vs. the Yankees on the arm of Chris Tillman, who became the first Orioles pitcher to win 14 games through 21 starts in a season since Sidney Ponson in 2003. 

— An MLB executive told ESPN there is a “70 percent” chance Chris Archer winds up with the Dodgers before the trade deadline. Archer, a 2015 All-Star, has struggled this season with a 4.60 ERA, but is a bargain at just over $38 million through 2021 (team options in ‘20, ‘21). 

What’s next

Phillies (44-53) at Pirates (49-46), 7:05 p.m. ET: The battle for Pennsylvania renews as Gerrit Cole (5-5, 3.11 ERA) takes the hill for the Bucs in his second start since returning from the DL. He gave up four runs on seven hits on Sunday. Zach Eflin (2-3, 4.14 ERA) toes the rubber for the Phillies looking for his sixth consecutive quality start. 

Indians (56-38) at Orioles (54-40), 7:05 p.m. ET: A potential ALDS matchup kicks off a three-game series as the AL Central-leading Indians send Trevor Bauer (7-3, 3.36 ERA) to the mound against Dylan Bundy (2-2, 3.70 ERA) and the O’s. Bauer is 5-1 with a 2.78 ERA on the road this season.