Heather Watson breaks into WTA world top 40 British tennis player Heather Watson has broken into the world's top 40 for the first time in her career. The 20-year-old from Guernsey leapt to a career-high 40 last month, but is now ranked 39th with fellow Briton Laura Robson remaining in 43rd spot. Watson reached the last eight of the US Indoor Championship and made it through to the last 16 in Pattaya City in January. Serena Williams holds the number one ranking after regaining it last week. The top 10 is unchanged, with the exception of Czech player Petra Kvitova, who moves up from eighth to seventh, swapping places with Italy's Sara Errani.