Viktor Fasth made 34 saves for the Ducks, who have hit the first skid in their remarkable season.
The Ducks have followed up their triumphant win over NHL-leading Chicago last Wednesday with three consecutive losses, including back-to-back defeats from Detroit by a combined 7-2 over the previous three days. Anaheim had won a franchise-record 13 straight home games before its current slump.
"We just haven't been anywhere near ourselves, and we haven't been for the last few games," Anaheim defenseman Sheldon Souray said. "I think we were soft in a lot of areas. They out-battled us in a lot of areas. They won a lot of the one-on-one battles, and they beat us at our own game."
The Sharks led 2-0 just 7:10 in on goals from Burns and Pavelski, who pounced for just his second goal since Feb. 11 when Sheppard jarred the puck loose from Perry in the slot. Havlat then scored just his fourth goal of the season on a long rebound in the slot in the opening minute of the second period, setting off scattered boos at Honda Center.
The Ducks finally answered midway through the period when the 20-year-old Etem got credit for a goal that went off the body of Sharks defenseman Brad Stuart. Beauchemin scored in the opening minute of the third period, firing a top-corner shot off a sharp setup by captain Ryan Getzlaf.
NOTES: Teemu Selanne didn't score while appearing in his 1,373rd NHL game, surpassing Teppo Numminen's record for Finnish players. ... Justin Braun took the lineup spot that likely would have been filled by Murray for the Sharks, who dressed seven defensemen. ... New Anaheim RW Radek Dvorak arrived from Europe earlier Monday and cleared waivers, likely allowing him to join the Ducks' lineup this week. The 36-year-old Czech will begin his 17th NHL season after playing 73 games for Dallas last year.