''I wanted this victory so badly,'' Petkovic said. ''I am very relieved. Shelby played very aggressive tennis. I didn't know her game but I've done some research on YouTube.''
Rogers, who came through qualifying and was ranked 147th, had not been beyond the second round of a WTA event before.
The 21-year-old American from Mount Pleasant, South Carolina, hadn't beaten a Top 50 player before but defeated No. 16-ranked Carla Suarez Navarro, No. 40 Camila Giorgi and No. 14 Sara Errani all in straight sets this week before going down to Petkovic.
''I had an incredible time,'' said Rogers, who has won four events on the lower-tier ITF circuit. ''This has definitely been a week I will never forget.''
Rogers broke Petkovic's serve for an early 2-1 lead but the German immediately leveled the score. At 3-3, Petkovic took six straight games to win the opener and build a 3-0 lead in the second.
Rogers closed the gap to 3-2 and then broke her opponent again when Petkovic was serving for the match at 5-2, but netted a backhand in the next game on the German player's first match point.
Source : https://www.tennis.com/news/articles/petkovic-defeats-rogers-in-bad-gastein-final203