MIAMI, March 29 — World number two Carlos Alcaraz said he felt like a frustrated 13-year-old searching for answers after his crushing defeat by Bulgarian veteran Grigor Dimitrov in the Miami Open quarter-finals on Thursday.

Alcaraz, 20, arrived in Miami in top form after winning the Indian Wells trophy, but his hopes of becoming the first man to complete the Sunshine Double since Roger Federer in 2017 were dashed in a 6-2 6-4 defeat.