Gretschko is among the Age of Empires II players representing Germany. Gretschko has played a total of 87 matches in Age of Empires II. Most of Gretschko's games take place on the ranked random map 1v1 ladder.

Among all available civilizations, Gretschko picks Lithuanians most frequently at 44.8%. Gretschko wins most often with Lithuanians—61.3% in 31 games. The map Arabia is where Gretschko shines, winning 51.5% of 33 games.

In the flank position, Gretschko has a 100.0% win rate across 1 games. RM 1v1 records show Gretschko at a rating of 1020. Gretschko has a win rate of 51.7% in RM 1v1 (87 games played).