Table:
text: Simon Greul
Singles titles
Singles titles
Date_ Tournament Surface Opponent Score
August 31, 2008 Freudenstadt , Germany Clay Matthias Bachinger 6–3, 6–4
September 7, 2008 Alphen aan den Rijn , Netherlands Clay Iván Navarro 6–4, 6–3
September 20, 2009 Todi , Italy Clay Adrian Ungur 2–6, 6–1, 7–6 (8–6)
June 11, 2011 Košice , Slovakia Clay Victor Crivoi 6–2, 6–1
October 28, 2012 Porto Alegre , Brazil Clay Gastão Elias 2–6, 7–6 (7–5) , 7–5

Question: What was the surface for Simon Greul as an opponent in Adrian Ungur?