Table:
text: Ace (tennis)
Women
Women
Aces Player Opponent Year_ Event Sets_ Result_
20 Serena Williams (3) Elena Dementieva 2009 Wimbledon 3 6–7 (4–7) , 7–5, 8–6
20 Serena Williams (4) Samantha Stosur 2012 Miami 2 7–5, 6–3
20 Venus Williams Lindsay Davenport 1998 Stanford 3 4–6, 7–5, 4–6
20 Kristina Mladenovic Michaëlla Krajicek 2012 Brisbane 3 7–5, 6–7 (8–10) , 6–2
20 Naomi Broady Caroline Garcia 2011 Birmingham 3 6–2, 6–7 (5–7) , 6–4
20 Nicole Vaidišová Jelena Janković 2006 Linz 3 5–7, 7–6 (7–5) , 6–4
20 Julia Görges Agnieszka Radwańska 2012 London (2012 Olympics) 3 7–5, 6–7 (5–7) , 6–4

text: Ace (tennis)
Women
Women
Aces Player Opponent Year_ Event Sets_ Result_
25 Alexandra Stevenson Alexandra Mueller 2013 Quebec City 3 7–6 (9–7) , 6–7 (3–7) , 6–7 (9–11)
24 Serena Williams Victoria Azarenka 2012 Wimbledon 2 6–3, 7–6(6)
24 Kaia Kanepi Lucie Safarova 2008 Tokyo 3 4–6, 6–3, 6–4
23 Serena Williams (2) Zheng Jie 2012 Wimbledon 3 6–7 (5–7) , 6–2, 9–7
22 Alicia Molik Venus Williams 2007 Tokyo 2 6–7 (4–7) , 3–6
22 Brenda Schultz Iva Majoli 1994 Birmingham 3 6–4, 5–7, 6–0
22 Meghann Shaughnessy Nicole Vaidišová 2005 Memphis 2 7–6, 7–6
21 Ekaterina Bychkova Lindsay Lee-Waters 2011 French Open 3 3–6, 7–6 (7–1) , 10–8

Question: Regarding the women of Ace (tennis), what was the last year that Samantha Stosur was the opponent by having 20 aces and playing 2+ sets?