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Three separate Guillermos (Mota, Quiroz and Moscoso) have played in the majors since 2012. All three have been Giants (including Moscoso, pictured above).
July 31 and the weeks leading up to it isn't just about "name" players changing addresses. Deadline day also creates an opportunity for young players blocked by veterans that they have no shot of displacing.
Older players who find themselves languishing on the farm after years in the bigs can be granted respites. Guys who simply need to escape town before being strung up by their team's fanbase certainly cannot be forgotten...
Jake Arrieta, Orioles to Cubs
He went to Chicago in the Feldman trade and threw very well in his initial pair of NL starts (one ER over 13 innings) before struggling in a loss to Washington Aug. 21.
Avisail Garcia, Tigers to White Sox
Garcia got extended "run" in the 2012 postseason for the Tigers and made one of the best defensive plays of October. Still, the AL champions signed Torii Hunter to hold down right field, forcing Garcia back to the minors for most of the year.
The White Sox nabbed him in the three-team Jake Peavy swap and made him a starter upon Alex Rios' departure. Since that date, Garcia has but one hitless game and is riding a nine-game hit streak as of Aug. 22.
Grant Green, Athletics to Angels
The 13th overall pick in the 2009 draft started out as a shortstop and then moved to the outfield, but by 2012, he was without a true position of his own—except the batter's box. Green, a top prospect almost from the moment he was drafted, went to the Angels in exchange for veteran third baseman Alberto Callaspo at the deadline.
Soon installed as the starter at second base, Green, who is an alum of nearby USC, played well before a 1-for-16 slump. In fact, he had five multi-hit games in his first eight Angels starts.
Matt Guerrier, Dodgers to Cubs
Guerrier was one of many Dodgers relievers who found himself demoted or shipped out due to ineffectiveness this season. The 35-year-old had coughed up runs in four of his final five Dodgers appearances before being designated for assignment and traded to the Cubs for Carlos Marmol July 2.
Sadly, Guerrier succumbed to flexor surgery a month later and won't pitch again this year. He had been unscored upon in his final eight Cubs appearances.
Scott Hairston, Cubs to Nationals
In the span of an offseason, Hairston went from one of the league's best role players to one of its worst. His playing time significantly down, the 10-year vet was dealt to Washington for prospects. Hairston's first homer as a Nat was a three-run shot off ex- teammate James Russell that sunk the Cubs Aug. 21.
L.J. Hoes, Orioles to Astros
Acquired in the Bud Norris deal July 30, Hoes has gotten the bulk of right field starts for his new team and batted .319 with four steals. He also enjoyed an 8-for-13 stretch. The 23-year-old Washington native was named Baltimore's top minor league position player of 2012.
Carlos Marmol, Cubs to Dodgers
In short: If the Cubs hadn't traded Marmol when they did, he might have been safer crashing into Wrigley's outfield wall than walking the streets of Chicago.
The beleaguered ex-closer, who was often an adventure even when at his best, is riding a streak of seven scoreless appearances as a Dodger through Aug. 22, almost all non-pressure situations by design.
Guillermo Moscoso, Cubs to Giants
Two years ago, Moscoso was a pretty decent starter for the A's, but the Giants mark his fifth organization since the 2012 World Series.
The Giants basically bought him from the Cubs (who had him stashed at Triple-A all year) to use in long relief. Despite serious command issues, Moscoso has chewed up innings.
Marc Rzepczynski, Cardinals to Indians
"Scrabble," who appeared in 141 games for the Jays and Cards over the past two years, got off to a wretched start in his '13 season and was demoted back to Triple-A after four big league seasons.
With St. Louis showing no signs of wanting/needing his services in the foreseeable future, Cleveland came knocking. The soon-to-be 29-year-old has allowed but one (unearned) run in nine games with the Indians.
Joe Thatcher, Padres to Diamondbacks
Thatcher's seven-year Padres stint came to an end when he was surrendered in the Ian Kennedy deal July 31. The lefty specialist (career lefty batting average against: .216) hasn't adjusted yet—his WHIP as a Snake is a whopping 2.2 as of Aug. 22.