A team has finished a game with 18-2 singles and extra-base hits 48 times since 1897, most recently Chicago White Sox on 10 September 2022. That is about one every 9,229 team-games.
Box score for the most recent one ↗
17-9 17-10 17-11 17-12 18-0 18-1 18-2 18-3 18-4 18-5 18-6 18-7 18-8
The whole distribution — Singles and Extra-Base Hits · All 18 shapes