Olympics-Curling-United States rock Sweden to win first gold medal

* Last-rock magic from skip Shuster

* Ivanka Trump leads cheers for U.S. team (Adds details)

By Steve Keating

GANGNEUNG, South Korea, Feb 24 (Reuters) - The United States delivered a gold-medal knockout punch, scoring five in the eighth end to crush Sweden 10-7 and claim their first ever Olympic men's curling title on Saturday.

With the score deadlocked at 5-5, United States skip John Shuster provided some last-rock magic with a pinpoint double take-out for five that left their Swedish opponents stunned as the Gangneung Curling Centre erupted into chants of "USA, USA" led by U.S. President Donald Trump's daughter Ivanka.

The gold was just the second Olympic curling medal won by the U.S. men, following a bronze at the 2006 Turin Winter Games which Shuster was also a part of.

It meant more Olympic disappointment for Niklas Edin who had skipped Sweden to world championship titles in 2013 and 2015 and a bronze at the Sochi Olympics but could not grab the one medal to elude him.

The contest got off to a tactical start with the Swedes blanking the first then scoring a pair in the second only to have the U.S. hit right back with a two on another brilliant last-rock shot from Shuster.

The U.S. stole a point in the fourth after a measurement to determine shot stone to take their first lead, 3-2.

The Swedes would not be rattled, answering with two in the fifth as the seesaw battle continued with the U.S. replying with a pair in the sixth and Sweden getting one back in the seventh to leave the teams deadlocked on 5-5 with three ends to play.

After the U.S. scored their five a reeling Sweden chipped two off the deficit in the ninth but there was too much damage to repair and the Swedes finally conceded in the 10th. (Editing by Clare Fallon)