UNDATED (AP) — The Pittsburgh Penguins were less than a minute away from taking a three-games-to-none lead in the NHL's Eastern Conference semifinals. Instead, the Ottawa Senators pulled within 2-1 in the series with a double-overtime win over Pittsburgh.

Colin Greening beat Tomas Vokoun (voh-KOON') at 7:39 of double-overtime as the Senators beat the Penguins 2-1 to stay unbeaten at home in the postseason. Vokoun was about to pick up his second shutout of the playoffs and improve to 5-0 since replacing Marc-Andre Fleury until Daniel Alfredsson scored a short-handed goal with 29 seconds left in regulation.

Craig Anderson turned back 49 shots and blanked the Penguins after Tyler Kennedy scored with 67 seconds left in the second period.

Game 4 is Tuesday at Ottawa.

The Boston Bruins head to New York with a two-games-to-none lead in the Eastern Conference semifinals.

Johnny Boychuk snapped a 2-2 tie midway through the second period before the Bruins added a pair of third-period goals to beat the Rangers 5-2. Brad Marchand (MAHR'-shahnd) provided an insurance tally after scoring the overtime goal in the opener.

Tuukka (TOO'-kah) Rask made 35 saves and blanked the Rangers after Rick Nash beat him 3:20 into the second period. It was Nash's first goal of the postseason after pacing the Rangers with 21 during the regular season.

The Rangers host the next two games Tuesday and Thursday.

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