Serena Williams meets Na Li on Saturday in the 2013 Cincinnati Masters semifinals.  The match begins at 7 p.m. ET.  Watch the live stream HERE.

World No. 1 Williams continues her dominant season.  She entered the tournament with a 56-3 record and eight titles for the season.  After her two set win over Simona Halep (6-0, 6-4), she earned a spot in Saturday's semifinals.

Despite the wins at Cincinnati, Williams hasn't been happy with her performance.

"I definitely haven't felt good all week, so surprised I'm still in the event, to be honest," Williams told reporters, via FirstPost.com.  "It's not really about how you play at the end ... it's about being able to win, whether you play good or bad.

"I was able to so far and be in the semi-finals.  So, you know, considering, it's a good result.  I obviously want to do better, and I'll just see how it goes."

She faces Li, ranked No. 5 in the World.  Prior to the start of the Cincinnati Masters, Li had a 30-10 record on the season and one title to go along with it.  19-year-old Lauren Davis met Li first, taking her to three sets before falling.  Angelique Kerber followed - Li won, 6-4, 6-4.  Li earned a spot in the Women's semifinals after Agnieszka Radwanska withdrew on Friday from the tournament.

Saturday marks the 10th time Williams and Li have met.  Williams traditionally has gotten the better of Li, who has only won two of their previous nine matches.  The two last met on the hard court at Miami, where Serena won in two sets, 6-3, 7-6(5).  

*Stats via WTATennis.com and MatchStat.com.