Seattle struggled all last year with starters Jeff Weaver and Horacio Ramirez failing to give the club five or six innings.
Bedard was knocked out of Tuesday's game in the fourth inning in a 5-4 loss to the Angels that pushed the Mariners 14 1/2 games out of first place.
Much of the reason for the deficit lies in the fact that Seattle starters have failed to pitch five innings in 12 of their 59 starts -- more than 20 percent of the time.
Seattle starters are now 15-28 with an ERA of 5.23, far below the expectations the club had coming into the season.
ANGELS 5, MARINERS 4: Seattle scrambled for three runs with two outs in the fifth inning to pull within a run, but the Mariners got just one baserunner the rest of the way.
R.A. Dickey threw 5 2/3 scoreless innings in relief of Erik Bedard to keep the Mariners in contention, but a sixth-inning single by Jamie Burke gave Seattle its only baserunner in the final four innings of the game.
Jose Lopez had a solo homer in the fourth, but that was the only earned run Seattle got. The three runs in the fifth were aided by two Angels errors.
--RHP R.A. Dickey had what he described as his best knuckleball of the year Tuesday, and he used it to throw 5 2/3 shutout innings of relief against the Angels. Dickey has now thrown 13 1/3 scoreless innings combined in his last three relief appearances.
--2B Jose Lopez homered for the second time in two games Tuesday, enabling Seattle to stretch its streak of games in which a Mariners batter has homered to six. It's just the second time in his career that Lopez has homered in consecutive games. The last time was April 26-27, 2007.
--SS Yuniesky Betancourt doubled in his first two at-bats Tuesday, good enough for 16 on the season, the second best total among AL shortstops behind Oakland's Bobby Crosby (19). It was the seventh time in his last 10 starts that Betancourt has had a multiple-hit game.
--RHP Mark Lowe has allowed one earned run in his last six appearances. In a stretch that dates back to May 14, Lowe has thrown 9 2/3 innings for an 0.96 ERA while holding opposing hitters to a .182 batting average (6-for-33).
--LHP Erik Bedard and LHP Jarrod Washburn will take advantage of Thursday's day off to switch places in the rotation. Washburn will now pitch Sunday in Boston ahead of Bedard, whom pitching coach Mel Stottlemyre originally had planned to throw Sunday. Bedard will pitch Monday in Toronto.
--RHP Brandon Morrow has struck out seven of the last 13 batters he's faced. Over a longer stretch, he's allowed just one earned run in his last 14 appearances (11 1/3 innings).
BY THE NUMBERS: 8-20 -- Worst May record in Seattle history.
QUOTE TO NOTE: "I see us playing a lot better. I can see us start to win a lot." -- LF Raul Ibanez.
RHP Anderson Garcia (right shoulder tendinitis) opened the season on the 15-day disabled list. He restarted a rehab assignment with Class A High Desert on May 19.
RF Mike Morse (dislocated left shoulder) went on the 15-day disabled list April 14. He had shoulder surgery April 22 and probably won't play again this season.