The Thunder (43-12) didn't even need Westbrook for arguably their most impressive win of the season on Jan. 29, when they overcame an early 18-point deficit for a 112-95 victory in Miami.
"Obviously, it will be one of our biggest challenges of the regular season," Heat guard Dwyane Wade said. "After losing to them at home without Westbrook, you bring in a dynamic player at home where they play very well, we'll have to play as close to flawless as we can to beat this team."
Heat center Chris Bosh said facing the Thunder with their full complement of players is like looking into the mirror. After last month's loss to OKC, Bosh said the Heat got "a real good taste" of what other teams go through "when they have to play us."
Now, the Heat potentially must deal with even more speed, quickness and an elite scoring threat.
"We know what he's capable of," Bosh said. "They're a better team with him. He's going to be running up and down the court. That one-two punch with him and Kevin, that's something you have to really prepare for. You have to pick your poison. You can't have both. But we'll figure it out. We owe these guys."
Not even Westbrook's return can overshadow the main attraction of Thursday's game, which pits four-time MVP LeBron James against the league's leading scorer in Durant. Last week, Durant said he was beyond tired of having to be compared to James in the media and always fielding questions about him.
Durant's point was that the two have accomplished enough this season to warrant appreciation on their own merits. But the comparisons are seemingly inevitable, especially when James and Durant enter Thursday's game having scored at least 36 points in each of their respective team's past three games.
James is coming off a season-high 42-point effort in Tuesday's victory in Dallas that moved the Heat to 4-1 on an extended six-game road trip that ends Thursday. Durant went into the All-Star break after torching the Lakers for 43 points last Thursday, his seventh 40-point game since Jan. 1.
James has tried to downplay the significance of the matchup in recent days. But his actions on the court and the aggressive zone he has been in recently tell a different story.
"Is it a statement game? It's not a statement game," James said. "We don't need to make statement wins. We want to continue to play at the high level that we've been playing. It doesn't result in a win every time. But we don't want to take a step backward going back home."
Meanwhile, the Thunder will try to knock the Heat off balance again and complete the season sweep. Durant is on a mission to prove his team has closed the gap on the two-time defending champion Heat. James won his first title when Miami beat Oklahoma City in five games during the 2012 NBA Finals.
Since then, Durant has expanded his game and altered his approach with teammates.
And the result is a laser-like focus that has been two years in the making.
"I always had a killer instinct -- that's how you survive in this league, especially being 6-9 and 200 pounds, you know," Durant said. "You have to have something different to stand out with. I've been showing a little bit more emotion these last few years, but I always had the instinct. Whoever is in front of me, I always want to do my best to destroy them."