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Good friends square off for the semifinals and a WTA Rising Star tries to stay in the tournament as both round robin groups are in action on Thursday.

SINGAPORE - Every day we will bring you 10 things to look for from the BNP Paribas WTA Finals Singapore presented by SC Global - stats, nuggets... get your fix on all of that for Day 4, right here!

(Singles play begins at 1:30pm Singapore time - see TV listings here)

(6) Agnieszka Radwanska (POL #6) vs (8) Caroline Wozniacki (DEN #8)
Head-To-Head: Wozniacki leads Radwanska, 6-4

1) Radwanska could qualify for the semifinals if she wins this match.
If Radwanska beats Wozniacki in straight sets, she qualifies for the semifinals. And if she wins in three sets, she'll still qualify for the semifinals if Kvitova beats Sharapova in the next match.

2) Wozniacki could also qualify for the semifinals if she wins this match.
If Wozniacki beats Radwanska, regardless of whether she wins in straight sets or in three sets, Wozniacki will qualify for the semifinals if Sharapova beats Kvitova in the next match.

3) Wozniacki has somewhat of a substantial edge in this match-up.
Not only does Wozniacki lead Radwanska in their overall head-to-head, 6-4, but she's also won their only two meetings at indoor events (Stuttgart and the WTA Finals in 2011). And to top it off, she did win their only previous meeting this year, in straight sets too, at Cincinnati a few months ago.

(2) Maria Sharapova (RUS #2) vs (3) Petra Kvitova (CZE #3)
Head-To-Head: Sharapova leads Kvitova, 6-2

4) Kvitova is no stranger to beating Top 2 players.
Kvitova has four Top 2 wins, at the 2009 US Open (No.1 Dinara Safina), 2011 Paris [Indoors] (No.2 Kim Clijsters), 2011 Tokyo [Pan Pacific] (No.2 Sharapova) and 2011 WTA Finals (No.1 Wozniacki).

5) No matter what happens today, Sharapova will still have a shot at year-end No.1.
Even if Sharapova loses this match and Serena wins tonight, the race for year-end No.1 will go on.

6) Sharapova has a stranglehold on this head-to-head.
The 6-2 head-to-head record is 6-1 in completed matches (one of Kvitova's wins was a 4-3 retirement victory). Additionally, Sharapova has won her last five meetings in a row against Kvitova.

(1) Serena Williams (USA #1) vs (5) Eugenie Bouchard (CAN #5)
Head-To-Head: Serena leads Bouchard, 1-0

7) If Bouchard loses this match, she can't qualify for the semifinals.
Bouchard is already 0-2 in the Red Group, and an 0-3 record would mark the end of her tournament.

8) Bouchard is going for the biggest win of her career.
Until now, Bouchard's biggest win came against a No.3-ranked Halep in the Wimbledon semifinals this year. She's 0-3 lifetime against Top 2 players (all three of those matches came in 2013, losing twice to Sharapova in straight sets and once to Serena in three sets at Cincinnati - see below).

9) Serena won their only previous meeting, but it was not easy. Not easy at all.
Serena beat Bouchard in the second round of Cincinnati last year, 4-6, 6-2, 6-2. And Bouchard wasn't even really on the radar - Serena was No.1, Bouchard was No.62. Here's more on that match...

And the third doubles quarterfinal is also on the schedule...

(3) Black/Mirza (ZIM/IND) vs Kops-Jones/Spears (USA/USA)
Head-To-Head: Black/Mirza lead Kops-Jones/Spears, 2-1

10) Three of these four are playing here for the first time - and one for the 11th time.
While Sania Mirza, Raquel Kops-Jones and Abigail Spears are all making their WTA Finals debuts, Cara Black is playing this event for the 11th time in her career. Her first 10 appearances came in 10 straight years from 2000 to 2009 - the first four years she played with Elena Likhovtseva, then three years with Rennae Stubbs, then three years with Liezel Huber. She won it twice with Huber.