Also, her forehand is sometimes erratic and can produce many unforced errors. Ivanovic made a whopping 51 unforced errors in her match against Christina McHale. Keys has struggled against Stephens, often hitting more unforced errors than usual in their matches. Stosur lost in the first round to Sofia Arvidsson where she committed 48 unforced errors. She committed 31 unforced errors in the second and third set. My game is more consistent, there are not so many unforced errors. However, Na faded as the match went on and lost while committing 69 unforced errors. It's gentle, unforced and, despite its flaws, likeable. She again had a good ratio, with 20 winners to 9 unforced errors. Unlike typical vomiting, the regurgitation is typically described as effortless and unforced. Williams was 13-16 on winners and unforced errors. Writing in Forbes, Erik Kain described the storyline as "just a huge unforced error". He also complimented Wilson for being "chipper and unforced". The proper path is one which is natural and unforced. The eigenvalues of the system determine completely the natural response (unforced response).