WEST SACRAMENTO, Calif. — Shortly after leaving the mound at the end of an electric major league debut at Fenway late last month, Red Sox rookie Payton Tolle noted that he took a moment, as he was taken out of the game, to tell his infielders how “cool” he thought they were . It wasn’t a bit.

Tolle, now in his second full week as a big leaguer, hasn’t tried too hard to play it cool in his own right. Instead, a 22-year-old who was pitching in the Big 12 last year and started this season at High-A has repeatedly told himself to embrace, in his words, “the star-struckness of it all.”

Tolle, unlike fellow top prospects Roman Anthony, Marcelo Mayer and Kristian Campbell, didn’t spend any part of spring training with the major league club in February or March. He had met manager Alex Cora j

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