As of this week, he is the lone American to claim a tour title over the last 24 months.
Citi Open: Last American out, historic all-Canadian final →
"Second day in a row (I had) to play somebody with a massive serve," said Johnson, who is 4-1 in tiebreakers this week. "In a tiebreaker, anything can happen."
Berdych falls; Johnson, Raonic win at Citi Open →