PARIS—Thinking of her late coach the whole time, Barbora Krejcikova went from unseeded to Grand Slam champion at the French Open. Putting aside a shaky set, Krejcikova won just her fifth major tournament as a singles player by beating 31st-seeded Anastasia Pavlyuchenkova 6–1, 2–6, 6–4 in the final at Roland Garros on Saturday. When it ended with Pavlyuchenkova’s backhand landing long on the fourth match point for Krejcikova, a 25-year-old from the Czech Republic, they met at the net for a hug. Then Krejcikova blew kisses to the sky, her eyes squeezed shut, in a tribute to her former coach, Jana Novotna, the 1998 Wimbledon champion who died of cancer in 2017. “Pretty much her last words were just enjoy and just try to win a Grand Slam. I know somewhere she’s looking over me,” Krejcikova told the crowd at Court Philippe Chatrier, limited to 5,000 people because of the …