BALTIMORE (Interstat) — The Washington Nationals visit the Baltimore Orioles on Saturday at Oriole Park at Camden Yards, with first pitch scheduled for a cloudy 80-degree evening. Washington (41-41) enters with a .500 record, while Baltimore (38-44) looks to build on a one-run win in Friday’s series opener. The Nationals are installed as minus-1.5 favorites, with an over/under of 9. The game simulator projects a 5-4 Washington victory. The series is tight after the Orioles edged the Nationals 2-1 on Friday. The teams split a three-game set in Washington in May, with the Nationals winning 3-2 and 13-3 before the Orioles took the finale 7-3. Washington right-hander Cade Cavalli is a player to watch. In his most recent start Thursday against Philadelphia, Cavalli went 6 innings, allowing 5 hits and 2 earned runs with 7 strikeouts in a 10-5 loss. Over his last five starts, he has a 3.80 ERA across 23⅔ innings, striking out 21 while issuing 6 walks. He has been inconsistent, earning a win June 20 at Tampa Bay despite a short 2⅔-inning outing, and taking losses against Arizona and Miami. Baltimore catcher Samuel Basallo is a key offensive threat. He homered twice and drove in four runs Wednesday at the Los Angeles Angels in a 7-6, 10-inning loss. Over his last 10 games, Basallo is batting .286 with 2 home runs and 5 RBIs. He has been prone to cold streaks, going hitless in four of those contests. Both teams are navigating tight playoff races. Washington dropped four of its last six, including a series loss to Philadelphia. Baltimore is coming off a 10-game West Coast trip in which it went 5-5. The Orioles have won three of their last four at home against the Nationals. The Nationals’ Curtis Mead homered Thursday, while Jacob Young drove in two runs. For Baltimore, Trey Gibson and Tyler Wells combined for 5⅓ strong innings Wednesday in a losing effort. Following Saturday’s game, the teams meet again Sunday in the series finale. Washington then travels to Boston for three games, while Baltimore hosts the Chicago White Sox for three.