Set or tied 27 TOUR records. Won three consecutive majors (U.S. and The Open Championships, PGA Championship) and career Grand Slam and totaled nine TOUR victories. Non-adjusted scoring average of 68.17 best in golf history, surpassing Byron Nelson's 68.33 unofficial mark of 1945. Finished the year with 47 consecutive rounds of par or better and completing all 20 events started under par. Won TOUR player of the year honors. Joined Ben Hogan (1953) as the only men to win three professional majors in one season. Was 53-under in four majors, next-best mark was 18-under by Ernie Els. Nine TOUR victories most in one season since Sam Snead won 11 in 1950. Season-opening victories at Mercedes Championship and AT&T Pebble Beach National Pro-Am gave him wins in six consecutive starts, most since Hogan in 1948. Beat Els in a playoff at Mercedes, then came from seven strokes back with seven holes to play at Pebble Beach, keyed by an eagle-birdie-par-birdie finish, for a 64 and a two-stroke win. Finished T2 at Buick Invitational.
World Golf Championships-CA Championship: Logged 56th career TOUR victory and 13th official World Golf Championships title in 24th start at the CA Championship at Doral Golf Resort & Spa. Held the 36- and 54-hole leads before closing out a two-stroke win over Brett Wetterich, marking the 39th time winning (in 42 events) when holding at least a share of the third-round lead.
Woods collaborated closely with TAG Heuer to develop the world's first professional golf watch, which was released in April 2005. The lightweight, titanium-construction watch, designed to be worn while playing the game, incorporates numerous innovative design features to accommodate golf play. It is capable of absorbing up to 5,000 Gs of shock, far in excess of the forces generated by a normal golf swing. In 2006, the TAG Heuer Professional Golf Watch won the prestigious iF product design award in the Leisure/Lifestyle category.