SCOTTSDALE, Ariz. (AP) _ Kevin Rogers and Dave Burba, manager Dusty Baker's ''emergency starters,'' combined to pitch six innings of one-hit ball Saturday as the San Francisco Giants blanked the Colorado Rockies 6-0.

Rogers allowed only a first-inning single to Herm Winningham in his three- inning start. Burba, plagued recently with back spasms, pitched three perfect innings. They combined to strikeout five.

Rich Monteleone, Mike Jackson and Rod Beck each pitched an inning to complete the three-hit shutout. Beck, who had a club-record 48 saves last year, struckout two in the ninth and extended his consecutive scoreless streak to 12 innings this spring.

The Giants took advantage of two three-base errors by Colorado centerfielder Quinton McCracken to score four unearned runs and beat the Rockies for the fifth time in five meetings this spring.

Giants right fielder Willie McGee, being groomed to replace departed Will Clark in the No. 3 spot in the Giants batting order, continued his spring-long struggle. He walked and scored a run in the third and knocked in a run with a sacrifice fly in the sixth. But he also went 0-for-2 and saw his average drop to .140 with no extra-base hits in 16 games.

Prior to the game, the Giants gave outfielder Luis Mercedes his unconditional release. Acquired in a trade with Baltimore last April for pticher Kevin McGehee, Mercedes hit .160 in 18 games with the Giants last season. He was hitting .333 this spring.