Serena Williams’s Next Challenge? The Rest of Her Life.

Since retiring, Williams has directed that drive at new projects. She has a venture-capital fund, which mostly invests in founders who are women or people of color, and she just started a makeup line. She and her husband, the Reddit co-founder Alexis Ohanian, also have two small girls: Olympia, who is 6, and Adira, who will turn 1 this summer. So it’s not exactly like Williams has been idle. But the tennis court still calls.