2013 US Open Series
In tennis, the 2013 US Open Series was the tenth edition of the US Open Series, which included ten hard court tournaments that started on July 20, 2013 in Atlanta and concluded in Winston-Salem for the men and in New Haven for the women on August 24, 2013. This edition consisted of four separate men's tournaments and four women's tournaments, with the Western & Southern Open hosting both a men's and women's event. The series was headlined by two ATP World Tour Masters 1000 and two WTA Premier 5 events. Rafael Nadal and Serena Williams were the US Open Series winners, making them eligible for a $1 million bonus if either also won the US Open, a feat which they both accomplished, hence receiving the largest paychecks to date for a single tennis tournament, totalling $3.6 million each.
Point distribution for series events
In order to be included in the standings and subsequently the bonus prize money, a player needed to have countable results from two different tournaments. The players who finished in the top three in the series can earn up to $1 million in extra prize money at the US Open.| Round | ATP World Tour 1000 WTA Premier 5 | ATP World Tour 500 & 250 WTA Premier |
| Winner | ||
| Finalist | ||
| Semifinalist | ||
| Quarterfinalist | ||
| Round of 16 |
US Open Series standings
The standings include all players who received points in at least two tournaments.ATP
Notes:- 1 – Tours – Number of tournaments in US Open Series in which a player has reached the quarterfinals or better, in 250 and 500 series events or the Round of 16 in ATP World Tour Masters 1000 events.
WTA
- 1 – Tours – Number of tournaments in US Open Series in which a player has reached the quarterfinals or better, in Premier events; or the Round of 16 or better in Premier 5 events.
Bonus Prize Money
2013 schedule
| Week | Date | Men's Events | Women's Events |
| 1 | July 22 – July 28 | Atlanta BB&T Atlanta Open 2013 Champion:  John Isner | Stanford Bank of the West Classic 2013 Champion:  Dominika Cibulková |
| 2 | July 29 – August 4 | Washington, D.C. Citi Open 2013 Champion:  Juan Martín del Potro | Carlsbad Southern California Open 2013 Champion:  Samantha Stosur |
| 3 | August 5 – August 11 | Montreal Rogers Cup presented by National Bank 2013 Champion:  Rafael Nadal | Toronto Rogers Cup presented by National Bank 2013 Champion: Serena Williams |
| 4 | August 12 – August 18 | Cincinnati Western & Southern Open 2013 Champion:  Rafael Nadal | Cincinnati Western & Southern Open 2013 Champion:  Victoria Azarenka |
| 5 | August 19 – August 25 | Winston-Salem Winston-Salem Open 2013 Champion:  Jürgen Melzer | New Haven New Haven Open at Yale 2013 Champion:  Simona Halep |
| 6–7 | August 26 – September 9 | New York US Open 2013 Champion: Rafael Nadal | New York US Open 2013 Champion: Serena Williams |