I am very happy; just trying to stay level-headed, I guess."Australia's mixed doubles pairing of Marc Polmans and Storm Hunter have watched a handsome lead agonisingly slip away, and the rare chance of winning a Wimbledon final disappear with it on Centre Court.Victoria's Polman and Rockhampton-born former world doubles No.1 Hunter succumbed 4-6, 7-5, 6-2 to Latvia's Jelena Ostapenko and El Salvador partner Marcelo Arevalo.The experienced duo of Polman and Hunter, who reached the Australian Open semifinal together five years ago, had looked on course to become the first all-Aussie duo to win the mixed crown at Wimbledon in 35 years, since 1991, when John Fitzgerald and Liz Smylie took the title.Up a set and 3-1, they appeared on course to be the first Aussie victor in any mixed final since Sam Stosur prevailed alongside Serbian Nenad Zimonjic 12 years ago.But former French Open champion Ostapenko found her range for the second seed in the second stanza, as the unseeded 31-year-old Hunter, the former world No.1 doubles player, and 29-year-old Polmans saw their lead evaporate on a warm evening after another steaming day at SW19."I loved every second out here today I enjoyed it, Stormy, thank you so much for playing — it's a pity it's over," Polmans told his partner at the court presentation, while Hunter agreed: "It was so much fun to be back here, three years since I've been back at Wimbledon