Chicago Cubs at San Diego Padres

For the sixth and final time of the 2010 season, the Padres went throwback, wearing their 1984 duds again. Like in the final games of the 1984 NLCS, the Cubs declined to participate.

Arizona Diamondbacks at San Diego Padres

The Padres went retro for the fifth time this year, again wearing the 1978 duds against the non-participating Arizona Diamondbacks.

Baltimore Orioles at Tampa Bay Rays

The Orioles wore all-orange, which they wore twice in 1971, while the Rays dressed as the minor league Tampa Tarpons of the mid-1970s.

Note: Special thanks to Thomas, who submitted this on the comments page, I had had the wrong date, it is corrected to August 13.

Pittsburgh Pirates at San Diego Padres

Both teams dressed in 1978 throwbacks, the Padres in the mustard and brown outfit they've worn a few times in 2010, and the Pirates in a nice looking pinstripes jersey over black pants combo with the yellow pill box hat.

Pictures are screenshots from MLB.TV and Cox 4 San Diego:

Minnesota Twins at Cleveland Indians

Special thanks to The Ballpark Guide for these pictures.

Baltimore Orioles at Kansas City Royals

The visiting Baltimore Orioles dressed as the 1950s Baltimore Elite Giants and the Royals were dressed as the 1949 Kansas City Monarchs as the teams played in an annual Negro League tribute game. Billy Butler's two-run home run in the eighth inning was the difference as the Royals won 4-3.

Los Angeles Dodgers at San Diego Padres

On their third of six "Throwback Thursdays" of 2010, the Padres, wearing their 1978 Road Uniforms, defeated the non participating Dodgers 3-2 on a bottom of the ninth walk-off pinch-hit single by Oscar Salazar that drove in Jerry Hairston with the winning run.

Cincinnati Reds at Houston Astros

In what would turn out to be Roy Oswalt's final start for the Astros, who were wearing their 1989-93 uniforms, he gave up six runs on nine hits in five innings in a 7-0 loss to the non-throwback Reds. Oswalt was traded to the Phillies five days later.

Washington Nationals at Baltimore Orioles

The Orioles, honoring the 30th anniversary of their 1970 World Series championship, defeated the Nationals, who were dressed as the 1963-71 expansion Senators who would later become the Texas Rangers. Before the game Earl Weaver was "thrown out" of the game as he accompained interim manager Juan Samuel to home plate with the lineup card.

Pittsburgh Pirates at Oakland Athletics

The A's defeated the Pirates 5-0 on 1970s Turn Back the Clock night. Both teams wore flashy uniforms from the 70s, with the A's in bright yellow and green and the Pirates in black and gold. Pittsburgh even dusted off its famed pillbox caps, although their yellow ones shouldn't have had stars. The Pirates and A's were dominant teams in the 70s, combining for five World Series titles.

Seattle Mariners at Milwaukee Brewers

Pittsburgh Pirates at Detroit Tigers

Another Negro League matchup, as the Pirates dressed as the Pittsburgh Crawford(s) again, and the Tigers were again the Detroit Stars.