Go inside the numbers and matchups that will decide Wednesday's game, and then vote for which team will win at the bottom of the page.
What we learned in Game 4
Aaron Sanchez outpitched Corey Kluber as the Indians managed only two hits, Josh Donaldson homered and saved a run with a diving stab at third, and the Blue Jays tacked on some late runs for a 5-1 victory. -- David Schoenfield
Inside the pitching matchup
When Ryan Merritt is on the mound: The 24-year-old rookie is a finesse lefty with 11 innings and one career start under his belt. He did pitch well in those 11 innings, giving up six hits and no walks. At Triple-A Columbus, he had a 3.70 ERA but only 92 strikeouts in 143⅓ innings, so the Indians' defense is going to have to make some plays behind him. He throws an 87-88 mph fastball, changeup, slider, curveball and cutter and the occasional kitchen sink.
His minor league data suggests he's not a big ground-ball guy. He gave up 15 home runs but keep in mind the Triple-A home run rate was much lower than the MLB rate. As Jose Bautista said after Game 4, however, since the Blue Jays have never seen Merritt that could be an advantage for him.
You have to think that Terry Francona will turn once again to his bullpen as he did in relief of Trevor Bauer in Game 3. Neither Andrew Miller nor Cody Allen pitched in Game 4, so they're both available for longer stints if the Indians can take a lead in the middle innings. -- Schoenfield
When Marco Estrada is on the mound: That won't be easy, because Estrada has pitched two excellent games in the postseason, giving up three runs in 16⅓ innings. In Game 1, he threw an eight-inning complete game in a 2-0 loss, Francisco Lindor's two-run homer the difference.
Estrada expertly keeps hitters off-balance with his upper 80s fastball and seemingly unhittable changeup, maybe the best in the game. Thrown 75-78 mph, Estrada has the ability to manipulate the changeup to both sides of the plate, so it's moving away from lefties on the outside corner and also away from righties on the outside corner to them. Batters hit only .159 against it with a 32 percent strikeout rate. He mixes in a curveball and a cutter, although he largely has ditched the cutter down the stretch, throwing only four of them in Game 1 and two in his other playoff start.
Estrada had the second-highest fly ball rate among qualified starters in the majors, so he doesn't give up a lot of hits. The key to beating him is hoping a couple of those fly balls leave the park. Unlike Marcus Stroman and Sanchez, Estrada didn't suffer much of a drop-off the third time through the order: .623 OPS the first time, .630 the second time and .707 the third time. -- Schoenfield
Player in the spotlight
Josh Donaldson. He's hitting .438 in the postseason with seven extra-base hits. He's the guy who seems to energize this team. He gets to face a lefty and he feasts on lefties. If the series heads back to Cleveland, it's probably because Donaldson has done something big. -- Schoenfield
Did you know ...
Cleveland could be grateful Toronto forced a Game 5. Of the eight teams to sweep an LCS in a best-of-seven format (since 1985), seven of them went on to lose the World Series, including the last five. The only team to sweep a best-of-seven LCS and go on to win the World Series was the 1995 Braves. -- ESPN Stats & Information
What will decide Wednesday's game
Cleveland has registered a .198 on-base percentage so far this postseason against off-speed pitches, second worst among teams to play multiple games this postseason. During the regular season, they ranked third in baseball with a .286 OBP against off-speed pitches, just in front of Toronto (.280).
Estrada threw his changeup at a higher rate than any other qualified starter in the regular season (28.6 percent), so the Indians will need to find their regular-season success against off-speed pitches to be able to clinch in Game 5. -- ESPN Stats & Information
Choosing sides: Who will win?
The Blue Jays finally showed a pulse in Game 4, and they'll make things really interesting with another win by Estrada over the untested rookie Merritt. The Indians haven't done things easily all season, and they're not about to start now. -- Jerry Crasnick
The Blue Jays are going to send this series back to Cleveland. Rookie lefty Merritt appeared to be very nervous talking to the media the other day. Perhaps that was just being in a new environment. However, how he is going to react with 40,000-plus Jays fans screaming and a lethal lineup? Toronto will take advantage.-- Andrew Marchand
Absolutely nothing about this series -- or the Division Series between the Indians and Red Sox, for that matter -- has gone the way I thought it would. So, I probably should go against the grain and predict that Merritt will pitch the Tribe to its first pennant since 1997. Sorry, can't do it. The Blue Jays' offense finally broke through in Game 4 and will tee off on the Indians' rookie lefty to send the series back to Cleveland. -- Scott Lauber
Where the series stands
The Indians are up 3-1 even though they're hitting a meager .164 in the series. The Blue Jays are hitting .204. This game feels like a complete wild card. Can Merritt keep the Indians in the game before the relievers enter? Can the Indians hit the ball out of the park off Estrada? How many outs can Miller get? Will Edwin Encarnacion or Bautista launch one? If there is a Game 6, it's J.A. Happ versus Josh Tomlin. -- Schoenfield