Shane Lowry will face Rory McIlroy in the first round of the WGC-Accenture Match Play Championship in Arizona on Wednesday.
With Phil Mickelson and Brandt Snedeker pulling out of the first of this season's world championships Lowry, winner of the 2009 Irish Open as an amateur, was in line to clash with second seed Tiger Woods.
But that changed when Swede Fredrik Jacobson, last man in as replacement for the injured Snedeker, finished joint third at the Northern Trust Open in Los Angeles and moved up on the world rankings from 66th into the top 50, leaving Lowry to face the world number one.
McIlroy versus Lowry is not the only all-Irish duel. Graeme McDowell has to take on Padraig Harrington.
Woods will now meet his former Presidents Cup partner Charles Howell, while third seed Luke Donald - joint 16th in his first event of the year at Riviera after a disappointing closing 75 - will be up against German Marcel Siem.
The draw also sees former winner Ian Poulter against Scotland's Stephen Gallacher and two more of the six-strong English contingent, Chris Wood and David Lynn, against Masters champion Bubba Watson and US Open champion Webb Simpson respectively.
Ok so looks like I'm playing número UNO in the first round. Gonna be great. Win, lose or draw I'm gonna enjoy every minute of it.— Shane Lowry (@shanelowrygolf) February 18, 2013
Tee-off times in the first round of the WGC-Accenture Match Play Championship at Dove Mountain, Tucson, Arizona, United States, on Wednesday (seeded positions in brackets, all times GMT):
1425 (12) Sergio Garcia v (53) Thongchai Jaidee
1435 (21) Matt Kuchar v (44) Hiroyuki Fujita
1445 (11) Ian Poulter v (54) Stephen Gallacher
1455 (22) Bo Van Pelt v (43) John Senden
1505 (9) Charl Schwartzel v (56) Russell Henley
1515 (24) Zach Johnson v (41) Glen Day
1525 (10) Jason Dufner v (55) Richard Sterne
1535 (23) Hunter Mahan v (42) Matteo Manassero
1545 (5) Justin Rose v (60) KJ Choi
1555 (28) Bill Haas v (37) Nicolas Colsaerts
1605 (6) Adam Scott v (59) Tim Clark
1615 (27) Jamie Donaldson v (38) Thorbjorn Olesen
1625 (8) Bubba Watson v (57) Chris Wood
1635 (25) Jim Furyk v (40) Ryan Moore
1645 (7) Lee Westwood v (58) Rafael Cabrera Bello
1655 (26) Martin Kaymer v (39) George Coetzee
1705 (13) Keegan Bradley v (52) Marcus Fraser
1715 (20) Ernie Els v (45) Fredrik Jacobson
1725 (14) Steve Stricker v (51) Henrik Stenson
1735 (19) Nick Watney v (46) David Toms
1745 (16) Dustin Johnson v (49) Alexander Noren,
1755 (17) Graeme McDowell v (48) Padraig Harrington
1805 (15) Webb Simpson v (50) David Lynn
1815 (18) Peter Hanson v (47) Thomas Bjorn
1825 (4) Louis Oosthuizen v (61) Richie Ramsay
1835 (29) Branden Grace v (36) Robert Garrigus
1845 (3) Luke Donald v (62) Marcel Siem
1855 (30) Paul Lawrie v (35) Scott Piercy
1905 (1) Rory McIlroy v (64) Shane Lowry
1915 (32) Rickie Fowler v (33) Carl Pettersson,
1925 (2) Tiger Woods v (63) Charles Howell
1935 (31) Gonzalo Fernandez-Castano v (34) Francesco Molinari