We’re about to watch the most wide-open Masters in decades, and the British bookies are having a field day. SkyBet, one of the dozens of online parlors, gives odds on the top five players as follows: Adam Scott: 9-1, Rory McIlroy: 10-1, Phil Mickelson: 11-1, Jason Day: 16-1, and Matt Kuchar: 20-1. (Ben Crenshaw, on the 30th anniversary of his first Masters title, trails the field at 2000-1.) But that’s just the start of the fun. You also can bet on pairs of players to win: Scott or McIlroy pays 4-1, Keegan Bradley or Lee Westwood 20-1, Webb Simpson or Steve Stricker 40-1. Or even four players: Scott, McIlroy, Day, or Mickelson pays 9-4. You can bet on the winning margin: A one-stroke victory pays 9-4, two strokes 3-1, four or more strokes 9-2. The odds on a playoff are 5-2, four or more players in a playoff 50-1. A hole-in-one is expected with odds at 4-5, but an ace at the 240-yard 4th is 33-1, and an ace by any specific player is 80-1. You can wager on who will finish as top player from each nation (Germany’s two entrants, Martin Kaymer and Bernhard Langer, go off at 2-5 and 7-4, respectively); top Amateur (Matthew Fitzpatrick and Chang Woo Lee lead at 3-1); top Senior (Fred Coupes heads the list at 13-8); top Lefty (Mickelson is 8-15, Bubba Watson 11-8, Mike Weir 25-1); and top Rookie (Jordan Spieth is 5-1, Patrick Reed 6-1, Harris English 7-1). You can even bet on what score the winner will post on 18: eagle 2000-1, birdie 100-30, par 8-15, bogey 7-2, double or worse 25-1. Of course you can’t bet on any of this legally until you get yourself outside the U.S. borders.