On December 5, Massachusetts held a special election for State Senate in the vacant Worcester & Middlesex seat. The election returns are incomplete, but it appears Republican nominee Dean Tran won. Also in the race were a Democrat (Susan Chalifoux-Zephir), an independent (Claire Freda), and a Green (Charlene DiCalogero). No one got a majority. See this story.
Last time this seat was up, in November 2016, the only candidate listed on the ballot was the Democratic incumbent, Jennifer Flanagan.