Winning streaks, finals streaks, majors, Calendar Year Grand Slams, before and after Patrick Mouratoglou - all the Serena Williams stats you need are right here.
WTA Staff

NEW YORK, NY, USA - There are a lot of numbers floating around when someone's going for this much history, so we thought we'd put them all in one place - we'll also update this after every one of her matches this fortnight. So here you are - all the Serena Williams stats you need for the US Open!

(this article was updated after Williams' fourth round win at the US Open)

Serena & Grand Slams
~ Serena is trying to win her first Calendar Year Grand Slam (only three other women all-time have accomplished the feat - Connolly in 1953, Court in 1970 and Graf in 1988)
~ Serena has the second-most Grand Slam titles in the Open Era with 21 (Graf 22)
~ Serena has the third-most Grand Slam titles all-time with 21 (Court 24, Graf 22)
~ Serena has the third-most Grand Slam match wins in Open Era with 285 (Navratilova 306, Evert 299)
~ Serena is trying to become the fourth woman in the Open Era to win five Grand Slam titles in a row (Court won six in a row once, Navratilova won six in a row once, Graf won five in a row once)
~ Serena is trying to win her seventh US Open title (wouldn't just be the first Grand Slam she'll have seven of, but also the most US Open titles for a woman in Open Era - currently tied with Evert at six)
~ This is Serena's 19th time being the No.1 seed at a Grand Slam (she's won 11 of the first 18)
~ Serena is 60-1 in Grand Slam first round matches (only loss: Razzano at 2012 French Open)

Serena & Finals
~ Serena is 21-4 in Grand Slam finals, the second-best winning percentage Open Era (Court was 11-1)
~ Serena has won her last eight Grand Slam finals (last loss: Stosur at 2011 US Open)
~ Serena has won her last 15 finals (last loss: Azarenka at 2013 Cincinnati)
~ Serena has won 30 of her last 32 finals (only losses: Azarenka at 2013 Doha & 2013 Cincinnati)

Serena & Winning Streaks
~ Serena is on a 33-match Grand Slam winning streak (last loss: Cornet in 2014 Wimbledon 3r)
~ Serena is on a 26-match US Open winning streak (last loss: Stosur in 2011 US Open F)
~ Serena is on a 49-match US hardcourt winning streak (last loss: Azarenka in 2013 Cincinnati F)

Serena & 2015
~ Serena has won more WTA titles than anyone else this year (five)
~ Serena has won more WTA-level matches than anyone else this year (53)
~ Serena is 53-2 so far this year (only losses: Kvitova in Madrid SFs, Bencic in Toronto SFs)
~ Serena is 18-1 in three-setters this year (only loss: Bencic in Toronto SFs, 3-6, 7-5, 6-4)

Serena & Age-Related Stats
~ Serena is the oldest woman to win a major in the Open Era (33y & 289d at 2015 Wimbledon)
~ Serena is the oldest No.1 in WTA history (set record when returned to No.1 on February 18, 2013)
~ Serena has the longest winning span between majors of any woman Open Era at 15 years and 10 months between 1999 US Open and 2015 Wimbledon (Evert, Navratilova and Graf had 12-year spans)
~ Serena has won eight majors since turning 30, the most after 30 by far in the Open Era (Court and Navratilova won three each, King and Evert won two each and Jones, Wade and Li won one each)

~ Serena, No.1, has more than twice as many ranking points as No.2 (first time in WTA history)
~ Serena is spending her 133rd & 134th straight weeks at No.1 during the US Open fortnight (third-longest streak at No.1 in WTA history after Graf's 186 and Navratilova's 156)
~ Serena is spending her 256th & 257th career weeks at No.1 during the US Open fortnight (fourth-most weeks at No.1 in WTA history after Graf's 377, Navratilova's 332 and Evert's 260)
~ Serena has the most career prize money in WTA history ($73.3M - next-most is Sharapova's $35.8M)
~ Serena has the fifth-most WTA titles in Open Era with 69 (after Navratilova, Evert, Graf, Court)
~ Serena was the first player this year to qualify for the eight-woman singles event at the BNP Paribas WTA Finals Singapore presented by SC Global (Halep has since qualified as well)

Before & After Patrick Mouratoglou
Serena joined forces with Patrick Mouratoglou after falling first round at the 2012 French Open, and the dynamic duo's numbers speak for themselves - here's a comparison of before and after Mouratoglou:

Pre-Patrick Mouratoglou
win-loss: 523-107 (.830)
WTA titles: 41
Grand Slam titles: 13 out of 47 (.277)
vs top 10: 111-59 (.653)

Post-Patrick Mouratoglou
win-loss: 214-15 (.934)
WTA titles: 28
Grand Slam titles: 8 out of 13 (.615)
vs top 10: 52-5 (.912)

This article used insights from WTA partner SAP, a worldwide leader in enterprise software.