Carlos Guillen to begin rehab assignment Monday at Single-A

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Finally, some positive news for Carlos Guillen.

David Mayo of the Grand Rapids Press reports that the veteran infielder has been cleared to begin a minor league rehab assignment and will get things started Monday with Single-A Lakeland.

Guillen has not played in a major league game since undergoing microfracture knee surgery in September of last season and is likely to need over two weeks of minor league at-bats in order to get his timing right. That puts his projected return somewhere around the All-Star break, maybe a little after.

Guillen, 35, is making $13 million this season in the final chapter of a four-year, $48 million extension that he signed with Detroit in March of 2007. He’s hit just .269/.352/.426 with 27 home runs and 129 RBI since the ink dried on that contract. The Tigers will hope for much better down the stretch this summer.

If Guillen gets going and proves capable of handling everyday innings, he should easily steal starting second base duties from Ryan Raburn, who is batting .199/.239/.329 through 64 games this season.

Eric Thames hit two more homers

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And John Lackey is livid.

The Brewers’ first baseman homered in each of his first two plate appearances against Reds starter Amir Garrett on Monday evening, helping his team to a 6-1 lead after two frames. The first was a solo blast in the first inning, and the second was a two-run shot to the opposite field in the second inning.

According to MLB.com’s Adam McCalvy, Thames has tied the Brewers’ record for home runs in April with 10. Carlos Lee also hit 10 homers in April 2006.

Seven of Thames’ 10 home runs have come against the Reds. Including his first two at-bats on Monday night, Thames is hitting .379/.474/.924 with 17 RBI along with the 10 dingers. Not too shabby from a guy the Brewers signed to a three-year, $16 million contract during the offseason.

Lackey and Cubs pitching coach Chris Bosio both recently implied Thames is using performance-enhancing drugs, but Thames was tested immediately after last Monday’s game against the Cubs.

Giants promote top prospect Christian Arroyo

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Alex Pavlovic of NBC Sports Bay Area reports that the Giants have promoted top infield prospect Christian Arroyo from Triple-A Sacramento. MLB Pipeline rated Arroyo as the Giants’ No. 2 prospect behind pitcher Tyler Beede and the team’s best position player prospect.

Arroyo, 21, was selected in the first round (25th overall) of the 2013 draft. He started the year at Triple-A for the first time and he hit an astounding .446/.478/.692 with three home runs and 12 RBI in 69 plate appearances to start the season.

The Giants, 6-13, are looking to regain their balance after unexpectedly losing ace Madison Bumgarner, who sustained injuries riding a dirt bike on an off-day. Arroyo will likely play third base regularly over Eduardo Nunez.