Martinez ranks fifth among American League catchers in the latest voting totals, behind Joe Mauer of the Twins, Jason Varitek of the Red Sox, Jorge Posada of the Yankees and Jarrod Saltalamacchia of the Rangers.
Indians outfielder Grady Sizemore has been out with left elbow inflammation since May 31. He currently ranks 14th among AL outfielders in fan voting for the All-Star Game, which takes place on July 14 in St. Louis.
Fans can cast their votes for starters up to 25 times with the 2009 All-Star Game Sprint Online Ballot at MLB.com and all 30 club sites until July 2 at 11:59 p.m. ET.
Starting rosters will be announced during the 2009 All-Star Game Selection Show presented by Chevrolet on TBS on July 5. Baseball fans around the world will then be able to select the final player on each team via the 2009 All-Star Game Sprint Final Vote at MLB.com.
And the voting doesn't end there. Fans will have the opportunity to participate in the official voting for the Ted Williams Most Valuable Player Award presented by Chevrolet at the Midsummer Classic via the 2009 All-Star Game Sprint MVP Vote at MLB.com.
The All-Star Game will be televised nationally by FOX and around the world by Major League Baseball International. ESPN Radio will provide exclusive national radio play-by-play, while MLB.com will offer extensive online coverage.
Martinez's offensive numbers this season rank among the American League's best. Entering Sunday's games, he was second in average (.335), third in hits (90), fifth in RBIs (53), third in on-base percentage (.412), and tied for 12th in extra-base hits (31).
Sizemore has made the last three All-Star Games.
Jesse Temple is an associate reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.