Andrew Sciarretta birdied the 18th hole to defeat Michael Vanderlaan 2-up in the semifinals of the 74th Connecticut Junior Amateur Wednesday at Watertown Golf Club.

Sciarretta, a Register All-Area selection for golf this spring and a senior-to-be at Fairfield Prep, trailed Vanderlaan 3-down through 10 holes. Then Sciarretta won four of the next five holes with par to go 1-up through 15. The next two holes were halved with par before Sciarretta’s birdie on 18.

Sciarretta, who plays out of Brooklawn Country Club in Fairfield, will face Connor O’Brien (Oak Hills Park GC) in Thursday’s final at 8 a.m. O’Brien advanced by beating John Aitken (Connecticut National GC) 7 and 6 in the semis. Aitken defeated Tim Rotermund from Madison CC in Wednesday’s morning quarterfinal round.