Accenture World Match Play Championship, Arizona:
Venue: Ritz-Carlton GC Dates: 17-21 February Coverage: Live on Sky Sports, regular updates on BBC Radio 5 Live, scorecards and reports on BBC website
Donald is still making his way back to form after wrist surgery in 2008
Paul Casey and Luke Donald continued their returns from injury with second-round wins at the Accenture World Match Play Championship in Arizona.
Casey, the 2009 runner-up, now recovered from a torn rib muscle, beat 2003 Masters winner Mike Weir 5&4.
Donald, returning to form after wrist surgery in 2008, went one better with a 6&5 drubbing of Robert Allenby.
Rory McIlroy lost to Oliver Wilson, Lee Westwood was knocked out by American Nick Watney, while Ian Poulter won.
Westwood, who lost 2&1, has still to go beyond this stage in 10 visits to the event and as a result misses the chance to go to world number two for the first time in his career.
The English world number four came back from two down to pull even after 13 but Watney, in his first Match Play appearance, regrouped to win the par-four 14th and 15th with birdies.
England's Ross McGowan, conqueror of top seed Steve Stricker, saw his run ended when he went down on the last to 18-year-old Japanese star Ryo Ishikawa.
Poulter made it four Britons through when he saw off Australia's Adam Scott 2&1.
"It's very pleasing," Poulter said. "It was never going to be an easy match - none of these is whether you are the number one seed or the 64th."
Defending champion Geoff Ogilvy was beaten 2&1 by Colombian Camilo Villegas, third seed Jim Furyk was knocked out by South African Charl Schwartzel while Spain's Sergio Garcia came from behind to defeat Dane Anders Hansen.
Ben Crane of the United States sprang something of a surprise by putting out US PGA champion YE Yang 3&2 and Brian Gay defeated American compatriot Zach Johnson.
Casey said of his win over Weir: "I didn't see any reason why Mike would struggle, but he did. The start was key - I was very surprised to be four up after four.
"Conserving energy is always a big one. When my legs get tired it affects my swing."
One of the most entertaining clashes of the day was between South Africans Ernie Els and Retief Goosen. Els sank successive 10-foot putts to stay alive at the final hole before losing out at the 20th hole.
Donald, runner-up on the PGA Tour two weeks ago, said: "Five birdies, no bogeys. I picked off the par fives and Robert didn't quite have his game. He didn't put too much pressure on me.
"I'm drawing on the confidence of the last few weeks. This is my fourth in a row, so to finish as quickly as possible is good for me."
Wilson, still searching for his first professional victory despite being part of Europe's last Ryder Cup side, is next up for Donald.
"I'm obviously delighted to be through," said Wilson. "It's mainly relief - that's a great scalp for me.
"We're only a small country and to have nine in the field is fantastic - a great achievement."
SECOND ROUND RESULTS:
(USA unless stated, seeded positions in brackets)
(12) Robert Allenby (Aus) lost to (21) Luke Donald (Gbr) 6 & 5
(6) Paul Casey (Gbr) bt (38) Mike Weir (Can) 5 & 4
(5) Rory McIlroy (Gbr) lost to (37) Oliver Wilson (Gbr) at 20th
(54) Brian Gay bt (22) Zach Johnson 2 holes
(58) Ben Crane bt (26) YE Yang (Kor) 3 & 2
(57) Jeev Milkha Singh (Ind) bt (40) Matt Kuchar 1 hole
(9) Ian Poulter (Gbr) bt (41) Adam Scott (Aus) 2 & 1
(10) Geoff Ogilvy (Aus) lost to (23) Camilo Villegas (Col) 2 & 1
(4) Martin Kaymer (Ger) lost to (36) Tim Clark (Rsa) 3 & 2
(13) Sergio Garcia (Spa) bt (45) Anders Hansen (Den) 2 & 1
(3) Jim Furyk lost to (35) Charl Schwartzel (Rsa) 3 & 2
(16) Robert Karlsson (Swe) lost to (48) Thongchai Jaidee (Tha) 4 & 3
(14) Sean O'Hair lost to (19) Stewart Cink 1 hole
(64) Ross McGowan (Gbr) lost to (32) Ryo Ishikawa (Jpn) 2 holes
(2) Lee Westwood (Gbr) lost to (31) Nick Watney 2 & 1
(18) Retief Goosen (SA) bt (15) Ernie Els (SA) at 20th