Chris Leyden, content analyst for Seat Geek, says the average resale price of a $125 gallery pass stood at $236 when play opened Thursday at Chambers Bay. That’s 2½ times the $95 price for a gallery pass a year ago, when the tournament was held at Pinehurst in North Carolina.

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Resale ticket prices are on pace to potentially make Sunday’s sold-out final round of the U.S. Open the most expensive ever.

Chris Leyden, content analyst for Seat Geek, says the average resale price of a $125 gallery pass stood at $236 when play opened Thursday at Chambers Bay. That’s 2½ times the $95 price for a gallery pass a year ago, when the tournament was held at Pinehurst in North Carolina.

“Unlike something like a Mariners game, when the vast majority of people buy tickets just days before, many people buy their tickets to the U.S. Open on the secondary market many months before the event,’’ Leyden said via email. “So, the average shouldn’t change too much this close to the event.’’

Seat Geek uses software to track ticket prices across major online aggregator sites like TicketNetwork, TicketsNow and RazorGator. It began tracking the U.S. Open in 2011 and says the most expensive day ever came when the Friday round in 2013 averaged $265 per ticket.

The cheapest day to attend this year’s event was Thursday, with prices averaging $135. Friday’s round was $183, while Saturday was $208.

Leyden said the overwhelming number of fans buying tickets hail from Washington and Oregon. But he added a “surprising” 11 percent come from Canada.

By noon Thursday, the average price of tickets already sold for Sunday’s finale was $247 on the StubHub resale site. StubHub spokesman Cameron Papp said that’s the second-highest Sunday average recorded by StubHub behind $261 for the final round in 2013.

The site began tracking U.S. Open sales in 2010. This year, Papp said StubHub had already sold one Sunday ticket for $2,350 — the highest the site has ever garnered for the U.S. Open.

Average sales prices for Thursday were $161, while Friday was $205 and Saturday was $222.

StubHub on Thursday still had 135 gallery seats listed for sale, the cheapest being $206 and the priciest at $9,000 for a V.I.P. pass with all-inclusive food, beverages and access to an air-conditioned lounge.