The Phillies failed to reach .500 for the first time since mid-April and dropped a series to the Nationals in a 6-1 loss on Sunday afternoon (see Instant Replay).
Cole Hamels pitched brilliantly for six innings before running into trouble in the seventh. Once again, the Phillies' offense didn't score for Hamels, who hasn't pitched with a lead since April 7 (see story).
Monday, the Phillies travel to Boston to take on the Red Sox for two games at Fenway Park before the teams both head south for additional two games at Citizens Bank Park.
Here is a look at some of the notable games from around the majors this Memorial Day:
Orioles at Nationals, 1:05 p.m.
The Beltway Series kicks off in the nation's capital, where the second-place Nationals host the third-place Orioles in the first action of the afternoon.
Jason Hammel (6-2, 5.37 ERA) takes the mound for the O's, who have given their right-handed pitcher a great deal of run support. Baltimore has scored five or more runs in nine of Hammel's 10 starts. The O's are 8-2 in those games.
Opposing Hammel will be a streaking Gio Gonzalez (3-2, 3.66 ERA). The young right-hander has been having a great month. Though he's only earned one win in his four May starts, he owns a 1.67 ERA and has struck out 21 while walking eight in the month. He's 1-2 with a 3.26 career ERA agains the O's in five starts.
Adam Jones may present the toughest test for Gonzalez. Though Jones is just 3 for 16 lifetime against Gonzalez, he owns one of the hottest bats in the American League having homered in four straight games. He's also hitting .347 since May 15.
Bryce Harper, who's batting .287 with 12 home runs this season, will sit on Monday afternoon due to a sore left knee.
The all-time Beltway Series record stands close, with the Orioles holding a 23-19 advantage.
Cardinals at Royals, 2:10 p.m.
The owners of the best record in baseball will visit Kansas City on Monday to begin a home-and-home series between the intrastate rivals.
The Redbirds have been an outstanding 17-6 in May; the Royals have gone 4-16 since their record stood at 17-10 on May 5.
For St. Louis, it'll be ace Adam Wainwright (6-3, 2.38) taking the hill. The lifetime Cardinal is a career 3-1 with a 3.18 ERA against the Royals.
James Shields (2-5, 2.47) opposes him. The innings eater has been great in his last four starts -- boasting a 1.74 ERA across 31 innings and striking out 30 men while walking just five -- but he's been the victim of little run support (1.25/game over the span) and has no wins to show for it.
Angels at Dodgers, 8:10 p.m.
In a matchup many predicted to be a World Series preview before the season began, the third-place Angels will meet the last-place Dodgers as the Freeway Series begins at Dodger Stadium.
Though still four games under .500, the Angels have put together a recent hot streak and will go for their ninth straight victory Monday night. The Dodgers have dropped six of their last nine.
Zack Greinke (2-1, 3.48) gets the nod for the home team, facing his former American League club in just his third start back from an early-season DL stint. The former Cy Young winner is 1-4 with a 3.70 ERA lifetime against the Halos and has enjoyed pitching in his new home, where he owns a 3-0 record and 1.02 ERA in three starts.
C.J. Wilson (4-3, 3.39) goes for the Angels. He's 2-3 in the May despite owning a 2.62 ERA in the month.