(Sports Network) - Lefty Scott Olsen will attempt to keep his winless skid from reaching double-digits today when the Florida Marlins host the Arizona Diamondbacks in the finale of a three-game National League series at Dolphin Stadium.

Olsen got off to a quick start this season and was 4-1 with a 2.22 earned run average after allowing just two hits in 8 2/3 innings against the Milwaukee Brewers on May 6.

He's not recorded another 'W' in nearly two months since, however, going 0-3 with six no-decisions in nine starts - in which the Marlins are 3-6.

Olsen earned a tough-luck no-decision in his last trip to the mound, giving up four hits and two runs in seven innings of the Marlins' 6-4 loss to Tampa Bay on June 24.

He's pitched at least five innings in seven of the nine winless starts and still enters today's game with a respectable 3.44 ERA in 99 1/3 total innings.

Olsen is 0-2 lifetime against Arizona, surrendering 20 hits and 13 runs in 10 innings.

For the Diamondbacks, righty Dan Haren looks for start No. 6 without a loss.

The former Oakland Athletics ace is 3-0 in his last five outings, including a 2-1 win at Fenway Park on June 23, in which he allowed Boston just two hits over seven scoreless innings.

Haren is 0-2 lifetime against the Marlins, including a 4-0 loss in Miami on May 22.

In that game, the former second-round draft pick was touched for eight hits and four runs in 6 1/3 innings, walking none and striking out eight.

On Saturday, Brandon Webb was effective on the mound to become the first 12- game winner in the majors this season, and the Diamondbacks beat up on the Marlins, 6-2.

Webb (12-4) threw six innings and gave up two runs on five hits while fanning eight and walking three. Juan Cruz, Tony Pena and Brandon Lyon combined to throw three innings of two-hit relief.

Chris Young went 2-for-4 with a triple and three RBI for the D'Backs, who snapped a three-game slide. Mark Reynolds had two doubles, two RBI and scored twice in victory.

Jorge Cantu had an RBI for the Marlins, who have dropped five of six overall. Cody Ross was responsible for the other Florida RBI.

Andrew Miller (5-7) took the loss as he was touched for six runs -- three earned -- on five hits in 5 2/3 innings of work.

The Marlins have beaten the D-backs in four of the five meetings this season.