Heather Watson into top 50 after victory in Osaka Heather Watson has climbed to 50th in the world rankings following her victory at the HP Open in Osaka. The 20-year-old became the first Briton in 24 years to win a WTA Tour singles title by beating Chang Kai-chen of Chinese Taipei on Sunday. Watson rose 21 places from 71st as she moved back to British number one. I really wanted to do well this week so I could earn my rest next week, because this is my last tournament of the year. I don't think I could have ended it any better," Watson told BBC Radio Five Live. Being in the top 50 was a real goal for me and it will push me to make harder goals for myself. I'm excited to have a break but I am looking forward to working hard again because it motivates me to achieve more. "Laura [Robson] and I have come through the rankings together, juniors and seniors and we're both very competitive, so when we see the other doing well, it pushes us," Watson added. It was the first ATP Tour victory by a British woman since Sara Gomer won in California in 1988 and Watson was in no mood to downplay the achievement. "I've been working to be more aggressive lately," she added. "When I got to the point when I was three match points down and she was serving for the match at 5-4 40-0 I just thought "oh no, I had this, I was so close," but I just took it point by point, I don't know how I did it but I did. Now I've got the title and I am so happy, this ranks as one of the best days of my life. Eighteen-time singles major winner Martina Navratilova paid tribute to Watson on Twitter, believing she was due some glory. Well done Heather - your determination, grit, talent and most of all hard work has finally paid off. Congrats:)," she tweeted. Meanwhile, Wimbledon champions Jonathan Marray and Frederik Nielsen have qualified for next month's ATP World Tour finals. Liverpool-born Marray, 31, and his Danish partner will play at The O2 after winning at SW19 and guaranteeing themselves a place in the top 20 in the Doubles Team Race to London. Their triumph at Wimbledon was one of the stories of the Championships - Marray became the first homegrown player to win the men's doubles at the All England Club since 1936, while 29-year-old Nielsen became the first Danish man to win a grand slam title - and Marray is hoping for a similar result when they return to the capital. "To be able to cap off the season by competing against the world's best doubles teams in front of a home crowd at The O2 in November will be incredible," Marray told www.atpworldtour.com. We had a great run at Wimbledon this summer, so hopefully we can reproduce some of that form in London this November. Nielsen said: "It will be amazing to get the experience of playing at The O2. It's an unbelievable set-up and an event I never thought I was going to be a part of as a player. So I will enjoy every second and can't wait to get started. British duo Colin Fleming and Ross Hutchins are currently ninth in the race rankings and could be on the reserve list. WTA RANKINGS: 1 Victoria Azarenka (Blr) 10955.00pts, 2 Maria Sharapova (Rus) 9135.00, 3 Serena Williams (USA) 7900.00, 4 Agnieszka Radwanska (Pol) 7265.00, 5 Petra Kvitova (Cze) 6515.00, 6 Angelique Kerber (Ger) 5470.00, 7 Na Li (Chn) 5095.00, 8 Sara Errani (Ita) 4855.00, 9 Samantha Stosur (Aus) 4330.00, 10 Marion Bartoli (Fra) 3850.00, 11 Caroline Wozniacki (Den) 3585.00, 12 Ana Ivanovic (Ser) 3075.00, 13 Nadia Petrova (Rus) 2845.00, 14 Dominika Cibulkova (Svk) 2845.00, 15 Roberta Vinci (Ita) 2405.00, 16 Maria Kirilenko (Rus) 2373.00, 17 Kaia Kanepi (Est) 2249.00, 18 Lucie Safarova (Cze) 2205.00, 19 Julia Goerges (Ger) 2025.00, 20 Christina Makarova (USA) 1841.00, 21 Varvara Lepchenko (USA) 1835.00, 22 Jelena Jankovic (Ser) 1751.00, 23 Yanina Wickmayer (Bel) 1680.00, 24 Sabine Lisicki (Ger) 1588.00, 25 Su-Wei Hsieh (Tpe) 1576.00, 26 Sorana Cirstea (Rom) 1565.00, 27 Tamira Paszek (Aut) 1552.00, 28 Jie Zheng (Chn) 1530.00, 29 Yaroslava Shvedova (Kaz) 1506.00, 30 Urszula Radwanska (Pol) 1490.00, 31 Klara Zakopalova (Cze) 1475.00, 32 Christina McHale (USA) 1451.00, 33 Carla Suarez-Navarro (Spa) 1450.00, 34 Francesca Schiavone (Ita) 1436.00, 35 Anastasia Pavlyuchenkova (Rus) 1430.00, 36 Sloane Stephens (USA) 1418.00, 37 Mona Barthel (Ger) 1416.00, 38 Daniela Hantuchova (Svk) 1410.00, 39 Shuai Peng (Chn) 1395.00, 40 Anabel Medina Garrigues (Spa) 1385.00, 41 Venus Williams (USA) 1370.00, 42 Aleksandra Wozniak (Can) 1320.00, 43 Alize Cornet (Fra) 1300.00, 44 Tsvetana Pironkova (Bul) 1285.00, 45 Flavia Pennetta (Ita) 1240.00, 46 Sofia Arvidsson (Swe) 1240.00, 47 Lucie Hradecka (Cze) 1224.00, 48 Simona Halep (Rom) 1220.00, 49 Vera Zvonareva (Rus) 1185.00, 50 Heather Watson (Gbr) 1165.00, 51 Anna Tatishvili (Geo) 1162.00, 52 Laura Robson (Gbr) 1153.00.