Your 2013 Citi Open primer, one number at a time.
1 - As in top seeds Juan Martin del Potro and Angelique Kerber for the ATP and WTA draws respectively. The 25-year-old Del Potro returns to the Fitzgerald Tennis Center in Rock Creek for the first time since winning the second of back-to-back titles in 2009. Ranked No. 7 in the world, the 6-foot-6 Argentine and former U.S. Open champion played Novak Djokovic this summer in the longest Wimbledon semifinal in history.
A two-time Grand Slam semifinalist, Kerber ended 2012 ranked fifth on the WTA Tour. The only player in the women's draw ranked in the top-10 this season, the 25-year German is after her third career singles title and first this year.
2 - As in Sloane Stephens, the highest seeded American in either draw. Playing in her first tournament since reaching the quarterfinals at Wimbledon, the charismatic 20-year enters this week ranked a career-high 15th. There are several promising young U.S. women in the event, including Christina McHale and 17-year-old Taylor Townsend, but Stephens, daughter of former NFL running back John Stephens, represents the best hope for an American Grand Slam champion. Her controversy with Serena Williams earlier this year, also pretty good.
6 - As in the number of past Washington champions returning, including James Blake and 2012 women's champion Magdalena Rybarikova. James Blake's lone singles title in Washington took place in 2001.
7- As in seed for Kevin Anderson, who spent part of his summer playing for the Washington Kastles. The imposing server missed the Kastles championship match, but Anderson had a rather decent excuse: reaching Sunday's final in Atlanta against John Isner. Speaking of the Kastles, Anastasia Rodionova makes the transition back to the WTA in her opening match against Melanie Oudin.
9 - As in the number of top 25 ranked players in the men's draw heading into the week, including No. 11 Kei Nishikori. The second seed this week, Nishikori won indoors at Memphis this year. Last year he became the first Asian in year-end Top 20 since 2003. With a 1-2 record in two previous D.C. appearances, the Japanese native is the only player among the top-10 seeded players with a losing record in Washington.
14 – As in the number of times a player whose first name started with the letter “A” won this championship in 32 years. Random factoid for sure, helped in the past by multiple time winners Andre Agassi and Andy Roddick - and 2012 men's champion Alexandr Dolgopolov, Dolgopolov. The No. 9 seed this year, Dolgopolov defeated Tommy Haas, who returns as the three seed.
15 - As in the number of all-time matches won in Washington by marathon man John Isner, the No. 8 seed. The 6-foot-10 American skipped last year's tournament for the London Olympics after playing the previous five straight years. Isner made a stunning run to the finals in 2007 and twice reached the semifinals, but hasn't hoisted the singles trophy. However, he did exactly that in Atlanta on Sunday and in Houston earlier this year.
16 - As in the number of men's doubles team in the field, none of which includes the legendary Bryan Brothers, who withdrew due to injury. D.C. native Treat Huey and partner Dominic Inglot are back to defend their title.
20 - As in Sam Querrey's ranking, the highest for any American male on tour. The sixth seed reached the semifinals last year, by far his best result in Washington. Five of his seven career singles titles have come on hard court.
32- As in the age of former world No. 1 Lleyton Hewitt, Washington champion in 2004. This past week the Australian reached the semifinals in Atlanta, as did American Ryan Harrison. The pair faces each other in the opening round with the winner meeting Del Potro.
500 - As in ATP World Tour 500 Tournament, which the Legg Mason Tennis Classis is one, making it one of the top 20 men's tournaments in the world.
1970 - As in the year of the first D.C. Tournament. Agassi leads with five singles titles.
Notes...Stephens, Blake and Mardy Fish highlight Monday's lineup. Blake plays at night on the Stadium court, followed by Rodionova-Oudin. Dolgopolov, Querrey and Kerber scheduled to begin play on Tuesday with Del Potro, Haas and Isner making their 2013 debuts on Wednesday.
* All rankings as of July 22