ELMONT, N.Y. - Dust off the Crown and place it on the handsome head of Big Brown, who will complete the first sweep of the Triple Crown races in 30 years with a victory in the Belmont Stakes on Saturday. This is likely to be Big Brown’s toughest race yet, as he’ll have to cover the testing 1½-mile distance with a cracked hoof that caused him to miss some training after his victory in the Preakness. The crack on the left front hoof, which was scheduled to be covered with an acrylic patch on Friday, did not appear to bother Big Brown during a workout at Belmont Park on Tuesday. But this will be the first time it has been tested in the heat of competition and, if it is at all sore, could be enough to get him beat. Trainer Rick Dutrow Jr. insists that the crack is not bothering his horse and said he will not use it as an excuse if Big Brown is defeated on Saturday. Big Brown has a couple other potential obstacles to overcome as well. He drew Post 1, which means he will break from the inside and risk getting pinned on the rail by rivals starting to his outside. He also was assigned a next-door neighbor in the starting gate with suspect manners — a “maiden,” or a horse who has never won a race, named Guadalcanal. Since inexperienced horses don’t always break straight, there’s also a chance that he could break inward and bump Big Brown in the initial strides of the race, which could prove disastrous. And it’s supposed to be hot. Forecasters are calling for temperatures in the low 90s on Saturday, and the humidity should be high after several days of heavy rainfall. I have no idea what the weather was like when he made his first career start last year at Saratoga on Sept. 3, but this is likely to be the hottest weather he’s encountered. Finally, Big Brown will have to beat one new foe among his nine challengers who could pose the sternest challenge he has ever faced. The Japanese-owned Casino Drive is bred for the Belmont Stakes, as his dam, Better Than Honour, gave birth to the last two winners of the race — the filly Rags to Riches and Jazil. If Casino Drive wins, that will be an even rarer three-bagger than the Triple Crown, as it is unheard of for a single mare to get the winners of three consecutive stakes races, let alone the Belmont Stakes. While 10 horses have won the first two races in the series — the Kentucky Derby and the Preakness Stakes — only to fall short in the marathon Belmont Stakes since Affirmed last won the Triple Crown in 1978, there are good reasons to think that Big Brown will not become the 11th straight to taste defeat. He is simply too good to lose to these horses if he is right. Big Brown’s greatest assets are his speed and tractability. He is capable of maintaining a high cruising speed through the early stages of the race, but he is not a “need to lead” runner and will settle wherever jockey Kent Desormeaux places him.