Agnieszka Radwanska failed in her latest mission on grass, upset in three sets by in-form American CoCo Vandeweghe at the Aegon Classic.
The #1 seed tasted her first career defeat to Vandeweghe, beaten 7-5 4-6 6-3 at the Birmingham event.
Yet the Pole, who had previously hit cruise control to see off Vandeweghe in straight sets in their trio of encounters last season, was off the pace throughout.
One break of service was enough for Vandeweghe, crowned Ricoh Open champion in the Netherlands, to snatch the opening set in 57 minutes.
But a potential third triumph over a top 10 player this campaign was in the balance after she wobbled and world #3 Radwanska levelled matters with a more disciplined second set that was broken up by rain delays.
Vandeweghe bounced back in the decider, edging ahead with a double-break lead, but then dropped her service game before clinching the match for a deserved victory with an amazing 48 winners in her favour.
But the big difference between the players was taking control at the net, where Vandeweghe was ruthless to register her first success over a top 5 player.
“You have all these rain delays, a lot of breaks, but I just stuck with my game plan.
“My confidence from last week and winning the title helps, so nothing really phases me and it’s just another match.”
Disappointed Radwanska admitted: “She was really consistent and solid, you can see how she won the tournament last week.
“My first match is always tricky without practice on grass, I needed a couple more days to adjust but hopefully Eastbourne will be better for me.”