The Brewers have won 13 of 15, thanks to timely hitting and solid starting pitching from a young staff.
Martinez, 23, is the latest unproven pitcher to take the mound for Milwaukee. The left-hander will likely have to fight off some jitters as he makes his major league debut.
“Any time you make your major league debut, you’ve got to be Superman not to be nervous,” Brewers manager Ned Yost said.
The 6-foot-6 Martinez was 4-0 with an 0.99 ERA in seven games at Triple-A Indianapolis after going 8-5 at Double-A Huntsville.
Milwaukee catcher Eddie Perez doubled and drove in two runs, lifting the Brewers to a 4-3 victory over the Reds on Tuesday.
Cincinnati, which has an inexperienced lineup because of trades and injuries, has lost eight of 10.
Third baseman Brandon Larson had surgery Tuesday in Cincinnati to repair the damaged labrum, rotator cuff, capsule and biceps tendon in his left shoulder. He is expected to be ready for spring training in 2004.
Catcher Jason LaRue was the only starter in the Reds lineup on Tuesday that started the season opener in March.
STANDINGS: Reds - 6th place, 12 1/2 GB, NL Central. Brewers - 5th place, 11 1/2 GB, NL Central.
REDS PROBABLE STARTER: John Bale (1-1, 2.76 ERA). The 29-year-old southpaw picked up his first win of the season in his last start. Bale went six innings, yielding two runs and seven hits in an 8-5 win over St. Louis on Friday. Bale has allowed two runs or fewer in four of his five starts.
BREWERS PROBABLE STARTER: Martinez (No record). Martinez averaged 9.07 strikeouts per nine innings in his seven starts at Indianapolis, where he had a 28 1-3 innings scoreless streak spanning his first five starts.
OFFENSIVE LEADERS: Reds - Sean Casey, .298 avg. and 67 RBIs; Adam Dunn, 27 HRs, 70 runs and 8 SBs. Brewers - Scott Podsednik, .317 avg. and 35 SBs; Richie Sexson, 36 HRs and 102 RBIs; Podsednik and Geoff Jenkins, 81 runs.
SEASON SERIES: Brewers, 9-8.
STREAKS AND NOTES: Reds - Cincinnati has scored three runs or fewer in 20 of its last 28 games. … 2B D’Angelo Jimenez is batting .308 with 18 RBIs and six stolen bases in 50 games with the Reds. … Cincinnati has committed a major league-high 121 errors. Brewers - 1B Sexson is on pace to drive in 121 runs. His personal high is 125 in 2001, and the club record is 126 by Cecil Cooper in 1983. … OF Podsednik is batting .365 with 13 stolen bases since Aug. 1. … The Brewers traded LHP Valerio De Los Santos to Philadelphia for a player to be named later. He was 3-3 with a 4.13 ERA in 45 appearances, all in relief this season.
ROAD/HOME RECORDS: Reds - 29-38 on the road; Brewers - 28-40 at home.
INJURIES: Reds - INF Barry Larkin (finger), 15-day DL; INF Larson (shoulder), 60-day DL; OF Dunn (hand), 15-day DL; RHP Jose Acevedo (ankle), 15-day DL; RHP Ryan Dempster (elbow), 15-day DL; RHP Jimmy Haynes (back), 15-day DL; LHP Mark Watson (kidney), 15-day DL; RHP Luke Prokopec (elbow), 60-day DL; OF Griffey Jr. (ankle), 60-day DL; OF Kearns (shoulder), 60-day DL; OF Taylor (shoulder), 60-day DL. Brewers - OF Jenkins (hand), 15-day DL; RHP Jayson Durocher (shoulder), 15-day DL; LHP Matt Ford (elbow), 15-day DL; RHP Nick Neugebauer (shoulder), 15-day DL; RHP Ruben Quevedo (shoulder), 15-day DL; RHP Todd Ritchie (shoulder), 60-day DL.