Two-time major golf champion Rory McIlroy and former women's tennis world number one Caroline Wozniacki announced their engagement Wednesday in postings on Twitter. McIlroy, the 24-year-old former world number one from Northern Ireland, posted pictures of himself and Wozniacki and a diamond ring on a woman's left ring finger. On her Twitter page, Wozniacki posted the same pictures with the caption "Happy New Year everyone! Rory and I started 2014 with a bang! … I said YES!!!!" Wozniacki, 23, withdrew from a WTA event in Brisbane last weekend due to a shoulder injury but the Dane was looking forward to playing at Sydney in a tuneup event for the Australian Open.