Watch Phil Mickelson trash talk Tiger Woods at The Northern Trust

The trash talk started on Twitter. Now it's spreading onto the course.

Earlier this week, Tiger Woods and Phil Mickelson announced their $9 million head-to-head showdown event, The Match, will be played over Thanksgiving weekend.

MORE: Tiger, Phil announce The Match | B/R Live

Immediately after the announcement, the two had some fun on Twitter (more on that below). But on Saturday, Phil took the trash talking out onto the course.

As Mickelson hit his tee shot on the par-3 No. 2 on Saturday at The Northern Trust, someone said, "That's gotta be better than Tiger's."

"Oh, it is," Mickelson replied.

The crowd's reaction to Phil's trask talk says it all.

Dialed. In.@PhilMickelson is feeling it early @TheNTGolf. #QuickHits pic.twitter.com/PsCZuXKY8B

— PGA TOUR (@PGATOUR) August 25, 2018

Mickelson did beat Tiger on the second hole. While Woods had a par, Mickelson birdied. Woods ended the round bogey-free and shot a 3-under on Saturday to reach 3-under for the tournament.

Mickelson also shot 3-under on Saturday, but he's 9-under through three rounds.

MORE: How Tiger, Phil compare in every round they played together

When the two went back-and-forth on Twitter, Tiger tweeted "It's on" at Phil.

Phil then tweeted back: "I bet you think this is the easiest $9M you will ever make."

It’s on @PhilMickelson #TigerVSPhil pic.twitter.com/PZivYPOEf5

— Tiger Woods (@TigerWoods) August 22, 2018

I bet you think this is the easiest $9M you will ever make

— Phil Mickelson (@PhilMickelson) August 22, 2018

Think you will earn some bragging rights?

— Tiger Woods (@TigerWoods) August 22, 2018

Let’s do this #TigerVsPhil

— Phil Mickelson (@PhilMickelson) August 22, 2018