Of the 11 games scheduled Week Ten only one won't have postseason implications. With scenarios where the first place Dodgers could miss the playoffs and the sixth place Yankees could win the Pennant this is as tight as the Palisades has ever been so late in the season. Week Nine the Cardinals and Brewers joined the Astros as teams who were mathematically eliminated but they will have every opportunity to play spoiler over the last four games.
The Dodgers (13-5) play a game against the Astros (2-12) and game against the Brewers (6-12) Week Ten. They will clinch a postseason spot with a win. With two wins and a split between the Expos and Padres they would secure a first round bye. If the Padres/Expos and Giants/D-Backs end in splits and the Dodgers sweep they would lock up the Pennant.
Giants, Padres, D-Backs, and Expos who are all 11-7 will clinch a postseason spot with sweep. If you weren't paying attention to the previous paragraph the D-Backs play the Giants and the Padres play the Expos Week Ten. The Expos are the only team in this group that can clinch with a split but they would need a sweep in Royals/Yankees and for the Mariners to lose a game against the Cardinals.
The Yankees (10-8) are currently in sixth place and Royals (10-8) are in seventh. They play each other Week Ten in what could be a two game set for the sixth and final seed. A sweep here would only clinch a spot if the Mariners lose a game Week Ten, a split would open the door.
Mariners (8-10) still have a shot at the postseason but there is no way they can clinch Week Ten. If they sweep the Cardinals (6-12) they will still be alive going into Week Eleven when they play the Brewers. The Dodgers, Padres, Giants and D-Backs all have the head-to-head tiebreaker over the Mariners. The good news is they have tie-breakers over the the two teams directly in front of them, the Yankees and Royals. The best chance for the Mariners hopes would be a split in Yankees/Royals and for the Padres to sweep the Expos.