Lexi Thompson is in the mix at the KPMG Women's PGA Championship. After two rounds, she’s in solo fourth, four shots behind leader Jeeno Thitikul. But she didn’t get there without a little extra stress.

Call her semi-retired. Or a part-timer. But as Lexi Thompson showed Friday in sweltering, blustery conditions, she’s no less competitive, especially when a major championship is on the line. Thompson’s 2-under 70 in the second round of the KPMG Women’s PGA Championship was the equivalent of going low on a day in which under-par rounds were as scarce as shade on the virtually treeless