MELBOURNE, Australia - Canada's Eugenie Bouchard missed her bid for a spot in the third round of the Australian Open, falling 6-4, 6-2 Wednesday to fourth seed Agnieszka Radwanska of Poland.

The 21-year-old from Westmount, Que., was playing in just her fourth tournament since suffering a concussion when she fell in the dressing room at last year's U.S. Open.

Bouchard had made it to the final last weekend in a tune-up tournament in Tasmania and had defeated Aleksandra Kuncic of Serbia 6-3, 6-4 to advance to Wednesday's match in Melbourne

Bouchard, who has now won seven of 10 matches in 2016, started strong against Radwanska by securing a 4-2 first-set lead with a break of serve on a winning drop shot. But Radwanska broke back a game later from a double-fault.

Bouchard was broken for a second time as Radwanska claimed a 5-4 margin and secured the opener after 48 minutes on a fifth set point, an inside-out forehand winner Bouchard could not reach.

Bouchard, who hit a backhand to the net to end the match, finished with 25 winners and 37 unforced errors, breaking only once from seven chances.

"Genie has been playing much better, she's not easy to play and is a tough challenge for me," said Radwanska.

Earlier Wednesday, both Toronto's Daniel Nestor and Vasek Pospisil of Vancouver made it through to the second round of men's doubles.

Nestor and partner Radek Stepanek of the Czech Republic needed just 58 minutes to dispatch Tsung-Hua Yang and Cheng-Peng Hsieh of Taiwan 6-1, 7-5 in their match, rattling off five aces and winning 86 per cent of their first-serve points.

Earlier this month, Nestor became the first player in ATP Tour history to record 1,000 doubles victories with a win in the opening round at the Apia International in Sydney.

In their match, ninth-ranked Pospisil and partner Jack Sock of the U.S. defeated Philipp Petzschner of Germany and Alexander Peya of Austria, 1-6, 7-6 (5), 7-6 (5).

In women's doubles, Gaby Dabrowski of Ottawa and Polish partner Alicja Rosolska lost their first-round match in one hour 36 minutes, falling 6-1, 7-6 to Johanna Konta and Heather Watson.

Dabrowski and Rosolska double faulted 11 times and had 31 unforced errors to 19 from Konta and Watson.

No. 13 seed Milos Raonic of Thornhill, Ont., will face unseeded Spaniard Tommy Robredo late Wednesday in second-round play. Raonic won his opener in three sets over Lucas Pouille of France.