MINNEAPOLIS -- Right-hander Nick Blackburn, who is on the disabled list with a left quad strain, made his first rehab start with Triple-A Rochester on Tuesday.

The sinkerballer allowed four runs (three earned) on four hits with three walks over 3 2/3 innings against Triple-A Charlotte. He struck out two and threw 68 pitches.

Blackburn is scheduled to make another rehab start with the Red Wings on Sunday, and if all goes well, he would then rejoin Minnesota's rotation.

Blackburn struggled in seven starts with the Twins, posting an 8.37 ERA before being placed on the disabled list on May 17.

Twins making killing on twin killings

MINNEAPOLIS -- The Twins have been using double plays to their advantage, entering Tuesday's game against the A's having turned two more than any other team in the Majors.

Minnesota has turned 69 double plays this year, including 14 in its last four games, entering Tuesday. They turned at least three double plays in each of those four games to mark the franchise's longest streak of games with at least three double plays since the club moved to Minnesota in 1961.

But as Twins manager Ron Gardenhire points out, there's also a bit of a negative in that statistic as well.

"There are two sides to that, because it means we're getting a lot of people on base," Gardenhire said. "But it also means we're getting lots of ground balls and turning double plays. Early in the season we missed a few of them, so we talked about transfers and making sure we get the first one. Guys have been working on it and they've turned some really nice ones."

Jamey Carroll has been a catalyst turning double plays, as he's seen time at third base, shortstop and second base. Carroll said he hasn't had troubles adapting and that everyone in the infield has a pretty good feel for each other.

"It's just paying attention to what a guy likes," Carroll said. "You can see it when you give the feeds to them more or you're getting the feeds back, how they're going to feed you. You should be able to make that adjustment pretty quickly."

Komatsu clears waivers, returns to Nats

MINNEAPOLIS -- Outfielder Erik Komatsu was sent back to the Nationals after clearing waivers, the Twins announced Tuesday.

Komatsu was designated for assignment on Sunday to make room for right-hander Jeff Manship on the roster.

As a Rule 5 Draft pick, Komatsu had to be offered back to Washington for $25,000 after he cleared waivers.

Komatsu, 24, was acquired by Minnesota via waivers from St. Louis on May 4 after he was designated for assignment by the Cardinals, who selected him in the Rule 5 Draft from the Nationals in December.

Komatsu hit .219 with one RBI and four walks in 15 games with the Twins. The Nationals assigned Komatsu to Triple-A Syracuse.