Normally the WTA gets a head start on the clay season in Charleston. This year the men—or at least the Spanish and German Davis Cup teams—caught up over the weekend, with their epic 3-2 bullfight in Valencia. This week both tours will take the next, small steps on the road to Roland Garros. Here’s a look at the four events kicking off on Monday, and what, if anything, they might tell us about the clay swing ahead.

Houston, Texas

$557,000; 250 ranking points

Red clay

Draw is here

John Isner is suddenly riding high again. After stumbling through the first three months of the season with a 2-5 record, he won the biggest title of his career at the Miami Open two weeks ago, and followed that up by leading the U.S. Davis Cup team to a sweep of Belgium in the quarterfinals in Nashville. Now he comes to Houston, a tournament he won in 2013. In past years, when Isner has had a good result, we’ve wondered whether he could replicate that success at a major; after all, his game makes him a threat to anyone. Now that he’s 32, there’s less reason to think that big, but maybe that’s a good thing for Isner. He can just try to do what he did in Miami—i.e., bomb serves and forehands—and see what comes of it.

As it is, Isner will come to Houston as the top seed and the favorite in this U.S.-heavy event. 14 fellow Americans, including his Davis Cup teammates Sam Querrey, Jack Sock, Ryan Harrison, and Steve Johnson, will join him there.

Wild card to watch: Nick Kyrgios

First-round match to watch: Frances Tiafoe vs. MacKenzie McDonald

John Isner's championship speech at the Miami Open:

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Lugano, Switzerland

$250,000; International

Red clay

Draw is here

With Roland Garros just beginning to come into view, it would seem to be an opportune moment for Kiki Mladenovic to find her form again, wouldn’t it? The Frenchwoman made a career-best quarterfinal run in Paris last year, but has struggled mightily since. But she’s still ranked in the Top 20, and she’s the top seed in Lugano.

Also here: Elise Mertens, Anett Kontaveit, Aryna Sabalenka, Su-Wei Hsieh, Laura Siegemund, Donna Vekic

Wild card to watch: Svetlana Kuznetsova

Elise Mertens' TenniStory:

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Marrakech, Morocco

$700,000; 250 ranking points

Red clay

Draw is here

Remember Kyle Edmund? The 23-year-old who made a breakthrough run to the semifinals at the Australian Open earlier this year? Well, he’s 0-2 since, having lost in the first round in Indian Wells and Miami—maybe the Brit doesn’t like sunshine. Now that Edmund is back across the pond, he’ll try to regain some of his momentum for the clay season in Marrakech, where he’s the No. 2 seed.

Also here: No. 1 seed Albert Ramos-Viñolas, Mischa Zverev, Alexander Dolgopolov, and 32-year-old, 355th-ranked Pablo Andujar, whose comeback continues.

Match point from Kyle Edmund's win over Grigor Dimitrov at the Australian Open:

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What's at Stake: Isner & Kyrgios in Houston; clay play goes global

What's at Stake: Isner & Kyrgios in Houston; clay play goes global

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This week on Tennis Channel Plus:

—ATP Houston Outer Courts (4/9-4/13)

Catch all the action from the U.S. Men's Clay Court Championship with outer court coverage live on Tennis Channel Plus beginning Monday April 9 at 4 p.m. ET

—ATP Marrakech Final (4/15)

Don’t miss the Grand Prix Hassan II final live on Tennis Channel Plus Sunday April 15 at 9 a.m. ET

—ATP Monte-Carlo (4/15-4/22)

Watch first to last ball of the Rolex Monte-Carlo Masters live on Tennis Channel Plus beginning Sunday April 15 at 7 a.m. ET