The visitors, who averaged 80 points per game in their first four victories, buried a trio of three-point shots from the right corner to pull away.
Sparkplug Rowan Miller, a sophomore, led the Pioneers with 18 points. Junior Ben Robinson and senior Westin Fryberger contributed six points each while sophomore Cory Hogan had five points and 10 rebounds.
The loss dropped Conestoga’s record to 3-2 overall, 2-1 in the league.
“(I) give Lower Merion credit,” said Stoga coach Sean Forcine. “They executed down the stretch and we had a couple stumbles offensively where we didn’t get the looks we wanted. We took a step in the right direction, but didn’t get the result we wanted. We’re going to keep working and get tighter on our offensive side. Our motto ‘Defense and Rebounding’ is going to be our staple for the rest of the season.”
The Pioneers return to action Dec. 19 at 5:15 p.m. at Upper Darby.