If the Seattle Mariners lose tonight's game (Game 4 of the ALCS), the most immediate consequence is that their series lead over the Toronto Blue Jays would shrink from 2-1 to 2-2. This would put the Mariners in a tied series situation, increasing the pressure as the series would become a best-of-three. The loss would mean that the Mariners no longer hold a commanding 2-0 advantage and would need to win two of the next three games to advance to their first World Series in franchise history. However, the Mariners still retain home-field advantage with Games 4 and 5 scheduled at T-Mobile Park, which is beneficial for them to try to regain control of the series. Historically, teams in a similar position—leading 2-0 and then losing Game 3—have a strong chance (around 73%) of winning the series nonetheless. So while losing tonight intensifies the challenge, it doesn't doom the Mariners, who can still advance to the World Series by winning two of the remaining four games in the best-of-seven ALCS. The team will likely adjust its pitching strategy accordingly and rely on strong performances in upcoming games to recover from the loss.

In summary:

• Losing tonight cuts the Mariners' series lead to 2-2.
• The series becomes a best-of-three for the Mariners.
• Mariners retain home-field advantage for Games 4 and 5.
• They still have a historically good chance to win the series despite the loss.
• Pressure and stakes increase for the Mariners to win upcoming games to advance to the World Series.