You Oughta Know: Key stats heading into Match Play

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Defending champion Jason Day and world No. 1 Dustin Johnson headline a stellar field at the WGC-Dell Technologies Match Play. Here is what You Oughta Know heading into golf's version of March Madness.

• Third year of pool play format in this event; second year held at Austin Country Club

• Defending champion: Jason Day (only one player has successfully defended, Tiger Woods 2003-04)

• Top overall seed: Dustin Johnson (won last two worldwide starts, Genesis Open and WGC-Mexico Championship)

• Last player to win three straight PGA Tour starts: McIlroy in 2014

• No. 1 overall seed has won four times (Woods three times and Rory McIlroy in 2015)

• Lowest overall seed to win: Kevin Sutherland, 62nd in 2002

• Lower seed has won 39.1 percent of matches all-time in tournament history

• McIlroy: 22 career matches won in this event (most of anyone in field)

• Day: One of three all-time with 20 or more matches won and .750 win percentage (Woods, Geoff Ogilvy)

Phil Mickelson is making his 50th career WGC start (fourth player all-time with 50 WGC starts)

• Justin Thomas has three missed cuts in five starts since back-to-back wins in Hawaii

• Player seeded 50th or worse overall has made semifinals each of last three years