\[RELATED: Complete Oilers vs. Ducks series coverage\]
Anaheim was 10-for-16 on the penalty kill in the first-round series against the Calgary Flames, a deficiency that was easy to overlook because of the four-game sweep.
Game 2 of this best-of-7 series will be played at Honda Center on Friday (10:30 p.m. ET; NBCSN, SN, TVA Sports).
"I think we did a good job in the series against Calgary, staying focused and patient, and maybe tonight we took one too many [penalties]," said Ducks forward Jakob Silfverberg, who was serving a holding penalty when Mark Letestu scored his second power-play goal of the game. "We gave them too many opportunities and, going forward, that's something we need to correct."
The Ducks had one of the better penalty-kill units during the regular season, finishing fourth in the NHL at 84.7 percent. But through five playoff games, their penalty-kill rate is 61.9 percent.
"We're giving five, six power plays a night, and it's hard to kill," Ducks center Ryan Getzlaf said. "Our PK has got to do a little bit better job. We have to work together a little bit better and we'll find ways to shut down their power play."
The Ducks took a 1-0 lead 37 seconds into the second period on a power-play goal by Getzlaf, but forward Nick Ritchie went to the penalty box for holding Oilers defenseman Oscar Klefbom at 4:39. Ducks defenseman Hampus Lindholm followed 66 seconds later after high-sticking Oilers forward Leon Draisaitl.