South Korea opened the World Cup like it wanted to repeat its 2002 run to the semifinals. Greece looked like it was stuck in 1994.
Lee Jung-soo and Park Ji-sung each scored and South Korea won 2-0 over lacklustre Greece in Saturday's first Group B match.
"If we had been a little bit calmer, we could have had an even better result," South Korea coach Huh Jung-moo said. "In terms of scoring goals, it could have been a little bit better for us."
Playing in its seventh consecutive World Cup -- including its 2002 appearance in the semifinals, when it co-hosted the tournament with Japan -- South Korea controlled the tempo from its first scoring chance on.
Greece has only been to the tournament once before, in 1994. Back then, the Greeks let Argentina score just two minutes into the opening game. The Greeks improved this time around -- by five minutes.
Ki Sung-yong curled in a free kick from near the left corner flag in the seventh minute, and the ball brushed the top of Konstantinos Katsouranis' head before reaching Lee at the far post. The central defender tapped it into an unguarded net.
Park Ji-sung doubled the lead in the 52nd with a slick solo goal.
The Manchester United midfielder intercepted a misplaced pass from Vassilis Torosidis and skipped past two defenders before slipping a shot beyond goalkeeper Alexandros Tzorvas.
Striker Park Chu-young had another three chances to score for South Korea, and Fanis Gekas had a shot saved with 10 minutes left in what was Greece's best chance.