The fourth-seeded Radwanska won on her eighth match point to close out a game in which she also saved three break points.
Last year, Radwanska became the first Polish woman since 1939 to reach a Grand Slam final before she fell to Serena Williams. On Thursday in the semifinals, Radwanska will face 23rd-seeded Sabine Lisicki, who knocked Williams out of the tournament then returned less than 24 hours later to beat Kaia Kanepi.
Radwanska had 18 unforced errors to 40 for Li, who won the 2011 French Open.
More Sports Headlines
Seahawks RB Lynch out multiple weeks after abdominal surgery Huskies wary of Cougars' running game and defense No. 10 Gonzaga rolls past Washington 80-64 in Bahamas M’s notebook: Hultzen clear waivers, sent to Triple-A Ex-Cowboys RB Randle arrested at Kansas casino Broncos bring in Ponder to add depth at QB NHLís Canadiens sign GM Bergevin to extension Late Frank Gifford suffered from degenerative brain disease
Our new comment system is not supported in IE 7. Please upgrade your browser here.