After being ranked fourth among European Goalies by CSS, Greiss was drafted by the Sharks in the 3rd round (94th overall) of the 2004 entry draft.interview with him.
2003-04: Greiss spent the majority of the season with the Cologne Jr. Sharks of the German Junior League (DNL), playing 1286 minutes, with a .910 save percentage and a 2.61 goals against average.
2004-05: Played his first season in the DEL for the Cologne Sharks. In 8 games, he posted a 2.09 GAA and .936 save percentage.
2005-06: Greiss enjoyed a breakout season for the Cologne Sharks (DEL). After taking over the starting position for injured netminder Oliver Jonas, he finished the season with a 15-7-1 record, a DEL third-best save percentage of .926, and a DEL sixth-best goals-against average of 2.46. His impressive performance earned him a spot on the German national team for the Deutschland Cup, a four-team tournament featuring Germany, Switzerland, USA and Canada. Greiss also earned a spot on Team Germany for the 2006 Winter Olympics. At 20 years of age, he was the youngest goaltender in the tournament, and had a 35 save performance on 40 shots against Team Canada.
2006-07: Greiss split time between the Fresno Falcons(ECHL) and the Worcester Sharks(AHL) in 2006-2007. In 43 games with Worcester, Greiss finished with a record of 26-15-2 and .912 save percentage. With Fresno, Greiss played just 3 games, going 1-2-0 with a .929 save percentage. Greiss saw playoff action with Worcester, but struggled immensely, going 0-3-0 with a GAA of 4.18. Greiss was also named to Germany’s Olympic squad, appearing as the youngest goaltender in the tournament. Greiss played one game, stopping 35 of 40 shots against Team Canada.
2007-08: Greiss’ lackluster playoff performance in 2006-2007 appeared to carry over into the 2007-2008 season. Greiss appeared in 41 games with the Worcester Sharks(AHL), finishing with a record of 18-21-2. Along with his sub .500 record, Greiss held a .892 save percentage and GAA of 3.09 with the Sharks farm club. A bright spot for Greiss was that he made his NHL debut, starting his first game on January 13th against the Anaheim Ducks, a 4-3 overtime loss.
2008-09: Proved to be a good season for Greiss. He improved in almost every statistical category, including shutouts after notching his first career professional shutout as a member of the Worcester Sharks(AHL). The German goaltender finished with a record of 30-24-2, a .910 save percentage, and a GAA of 2.47. Instead of crumbling like in past years, Greiss had a solid playoff for the Sharks, improving on his regular season stats by finishing with a .912 save percentage and a 2.43 GAA in 12 playoff games.
2009-10: Greiss was able to crack the San Jose Sharks(NHL) in 2009-2010, playing back-up to all-star Evgeni Nabokov. Greiss appeared in 16 games for the Sharks, going 7-4-0 with a .912 save percentage and a GAA of 2.69. In 2010, Greiss appeared in 3 games for Team Germany at the Vancouver Olympics. Greiss went 0-3-0 in his second tour of duty with Germany’s national team.
One of the top goaltending prospects to come out of Germany in recent years, Greiss was one of the top statistical goalies in the DEL. He plays a calm, focused game, and one of his strongest assets is his ability to read and anticipate plays. Because of this is he is usually one step ahead of shooters and is therefore able to rely on excellent positioning to make his saves. At 6’1 195 lbs, Greiss has good size and strength, particularly in his legs.