This year, that dubious honor has gone to Ryan Franklin. Franklin entered Thursday's game sporting a 3.49 ERA, yet was just 6-6 on the campaign.
The pattern continued once Franklin took the field to face Oakland in the series-finale at Network Associates Ballpark, as the Mariners scored just two runs for the right-hander in a 5-2 loss.
Oakland (48-36) moved back to six game behind the Mariners, right where they were when the four-game series started on Monday.
Seattle (54-30) in now 6-8 in their last 14 games.
While the Mariners have had difficulty hitting A's starter Barry Zito in the past, that wasn't the case in this game.
Zito allowed 10 hits for the second game in a row, continuing to struggle, yet managed to keep the Mariners from advancing around the basepaths.
The 2002 American League Cy Young Award winner didn't walk a batter and struck out five to help his cause.
Those were the only two runs Zito allowed before leaving after 7.1 innings with a 5-2 lead.
Oakland worked up its lead by putting continual pressure on Franklin (6-7). They knocked him around for 10 hits, and got on the board early.
It started in the first, when Erubial Durazo singled home Scott Hatteburg.
Edgar's homer made it 1-1 heading to the bottom of the fourth inning, but the A's answered with a run on a Terrance Long RBI single to move back in front.
Oakland tacked on two more in the fifth and another in the sixth to move ahead 5-1.
With Zito on the mound, that was all the run support the A's needed.
Corey Bradford and Keith Foulke pitched a perfect 1.2 innings of releif. Foulke, who recorded four of those five outs, recorded his 22nd save of the season.
Zito earned the win to improve to 8-5.
Boone led the Mariners with three hits and a steal, his seventh of the season.
Three Oakland batters - Durazo, Miguel Tejada, and Billy McMillon - had two hits apiece.