Here are points after Round 3. O'Keefe had a solid weekend, gaining max points. He's looking good to take the crown. Anyone within 75 points of him is mathematically eligible to get the crown still.
O'Keefe has a 5 point lead over Taha, and 44 over Mathei. These three are the only ones mathematically eligible for the championship.
Mathei requires A 1st and a 1st, or a 1st and a 2nd. The former scenario requires that Ken score no more than 5 points, and Taha score no more than 10 points. Mathei needs to win outright - he cannot win a tiebreak.
Tea needs to finish 1st to Ken's 2nd in the sprint, and can simply keep him behind him to win. Tea needs simply to gain either 5 in one race and loose none in the other, or outscore Ken by at least 6 points combined if he does not win. If Tea wins and Ken does not, and the two are tied, Tea would win the tiebreak with four wins to Ken's three.