By C. Trent Rosecrans
Best pitching matchup -- In his last three starts, Boston's Josh Beckett has returned to his ace status, going 2-0 with a 1.17 ERA and took a no-hitter through five in his last outing against the Angels, a no-decision that saw him give up two runs in eight innings. Baltimore's Jeremy Guthrie was the hard-luck loser in his last outing, allowing two runs over seven innings against the Twins, but still has a 3.12 ERA in four starts. Take out his bad start in Cleveland on April 16, and the right-hander has a 1.29 ERA. Red Sox at Orioles, 7:05 p.m. ET
Worst pitching matchup -- Add the ERAs of Giants starter Madison Bumgarner and Pirates starter James McDonald and you'll almost get 19. Bumgarner has been disappointing following his great postseason last year. So far this season, he's 0-3 with a 7.79 ERA. McDonald pitched well with Pittsburgh after coming over from the Dodgers last season (4-5, 3.52) but hasn't been good this season, going 0-2 with a 10.13 ERA in four starts. Giants at Pirates, 7:05 p.m. ET
Closer concern -- Everyone assumed Tony La Russa was just being coy and playing his normal games when he refused to call Mitchell Boggs his closer after demoting Ryan Franklin. Then La Russa caved and called Boggs his closer. On Tuesday, the Cardinals had their fifth ninth-inning blown save of the season and the first authored by Boggs. Heavy is the head that wears the closer's crown. Cardinals at Astros, 8:05 p.m. ETFor more baseball news, rumors and analysis, follow @cbssportsmlb on Twitter or subscribe to the RSS feed.