Making a sports bet online for Saturday’s matchup between Arizona and St. Louis could give some sportsbook players fits, as they’ll have to decide between two of the top pitchers in the National League.

Diamondbacks Cardinals odds – Saturday, 7:15 PM ET

Dan Haren (9-5, 2.01) has done more than step up in the absence of ace Brandon Webb, he dominated in the first half of the year and would have more wins if his team had scored more than three combined runs in his first three starts, when he allowed only four. The 28-year-old righthander, who actually spent the first two years of his career in St. Louis before he was traded for Mark Mulder, leads the NL in ERA, WHIP and is tied for the lead in complete games. Haren’s won his lone meeting with the Cardinals, and he’s a sparkling 4-1 on the road with a 2.36 ERA.

Adam Wainwright (10-5, 3.05) leads the NL in innings pitched, but he sometimes struggles with control as he is sixth in the league in strikeouts, but fifth in walks. The thing is, he should have a better Northbet.com record at home where he is 3-4 with a 2.35 ERA in 10 starts at Busch Stadium. The 27-year-old righthander has a solid 3-2 record in seven games (four starts) against the Diamondbacks in his career, posting a 3.04 ERA.

Baseball lines should favor the Cardinals at home, but it won’t be overwhelming as Haren has been arguably the most commanding pitcher in either league over the first part of the season. However, Haren’s career second-half numbers are far lower than his first half, while the opposite is true for Wainwright. Haren won’t get blown out or anything, but it looks like his St. Louis counterpart will do a number on the Arizona lineup.

Sports bet online pick: St. Louis Cardinals