Today on Tennis Channel: Alcaraz takes the doubles court as Laver Cup action kicks off in San Francisco

There's a total of five men's and women's events taking place this week—and all of them are streaming on the Tennis Channel app.

Here's five things you need to know about Friday's tennis, and where you can watch each event.

Laver Cup action kicks off in San Francisco, with Carlos Alcaraz taking the court—in doubles.

Day 1 of the star-studded three-day team event will feature four matches—three singles and one doubles.

The day session, which begins at 1pm local time, features two singles matches, beginning with Casper Ruud against Reilly Opelka—a match-up the Norwegian has dominated in the past, winning all four of the pair's tour-level meetings (including a 6-3, 7-6 (4) victory at Laver Cup in 2021). Jakub Mensik and Alex Michelsen will then clash in a first-time meeting.

The night session kicks off at 7pm local time with another singles match between Flavio Cobolli and Joao Fonseca, and if it's anything like their only previous meeting, it could be a thriller—the Italian fought off a match point to survive the Brazilian in Halle earlier this year, 5-7, 7-6 (3), 7-6 (8). Following that, Alcaraz will play his first match winning winning the US Open in doubles, partnering Mensik—the two of them will face American duo Michelsen and Taylor Fritz to round out the first day of play.

Every win on Day 1 counts for one point as Team Europe and Team World begin their quest for 13 points, and the Laver Cup.

👉 Stream ATP Laver Cup here.

Iga Swiatek and Barbora Krejcikova will collide in the quarterfinals of the WTA 500 event in Seoul.

It's Quarterfinals Day in the South Korean capital, and two of the most accomplished active women's players—a former No. 1 and a former No. 2, and both multiple Grand Slam champions—face off for a spot in the semifinals. Krejcikova, who famously won a match from eight match points down at the US Open a few weeks ago, against Taylor Townsend, just saved three match points to beat Emma Raducanu in the second round here, and she's given Swiatek all kinds of trouble in the past, winning two of their last three meetings. Swiatek snuck out their last meeting, though, a 4-6, 7-5, 6-2 victory in the round robin stage of the WTA Finals last fall.

Also in action in Seoul today are two hard-hitting women knocking on the door of the Top 10—Ekaterina Alexandrova and Clara Tauson, currently ranked just outside the elite at No. 11 and No. 12.

👉 Stream WTA Seoul here.

Italy and Ukraine will battle it out for a spot in the Billie Jean King Cup final.

The first of two semifinal ties at the Billie Jean King Cup Finals in Shenzhen, China takes the court today, as the Italians take on the Ukrainians. The players representing each team will be announced an hour in advance.

Leading the two teams are Jasmine Paolini and Elina Svitolina, and if they're chosen play each other, they've had an interesting history—they've met twice before, both times this year and both times at Grand Slams, and both times it was Svitolina who battled back from a set down to pull off the upset, defeating the Italian in the third round of the Australian Open, 2-6, 6-4, 6-0, and in the fourth round of Roland Garros, 4-6, 7-6 (6), 6-1.

The nations' No. 2s—former Top 20 player Marta Kostyuk and former Top 30 player Elisabetta Cocciaretto—could also put on a show, and if it comes down to it, a doubles showdown between the Kichenok sisters and reigning Roland Garros champions Paolini and Sara Errani could be on the card too.

👉 Stream WTA Billie Jean King Cup here.

The first round wraps up in Hangzhou.

There are two ATP 250s taking place in China right now, and at one of them, in Hangzhou, the last five first-round matches take the court today.

Among the players on the Friday schedule are two Americans, including Sebastian Korda, who plays his first match since retiring in the first round of the US Open three weeks ago due to a back injury—he'll face Australia's Adam Walton. Aleksandar Kovacevic is also on the schedule, taking on French qualifier Valentin Royer, with the winner set to take on top seed Andrey Rublev in the second round (who had a bye in the first round).

👉 Stream ATP Hangzhou here.

In Chengdu, the first round's done—and the second round begins.

The first four second-round matches take place in Chengdu, also with two Americans in action—Marcos Giron, who faces No. 8 seed Lorenzo Sonego, and No. 4 seed Brandon Nakashima, who faces Chinese wild card Shang Juncheng. Last year, Shang made history in Chengdu, becoming the first Chinese player ever to win an ATP title in China. Should Nakashima and Giron both prevail today, they'll face each other next in the quarterfinals.

👉 Stream ATP Chengdu here.