dunked a basketball
Absolutely. My neighbor and I used to ratchet his hoop down to 8 feet for our kids to shoot on. When the kids weren't playing, we'd stage dunk fests.

run 10 miles or more at one time
I once ran from the law. Not sure how far but it seemed like forever on that dark night; across fields and through woods. I ended up hiding in a briar patch.

won a title in a sport (individual or team)

I won the 1982 Lakeside Open Golf Tournament. I had the lowest score over 18 tough putting holes at Lakeside Amusement Park in Salem, VA.

gotten a hole in one
Of course, I've had many on the Lakeside course, plus I regularly score aces playing MIni-Putt on my computer. I have actually gotten to within an inch of a hole-in-one on the Par 3 second hole at my old home course, Greene Hills in Stanardsville, VA.

played against a professional athlete
I did shoot hoops at Lakeside Amusement Park against Marshall Ashford, former VT shooting guard. He was running the Basketball Game (paid--professional) and I was next door at The Birthday Game(paid-professional). My father, however, once played golf with Jimmy Piersall (Red Sox). He said that Piersall cheated a lot.

other, etc.

I have a 0-23 record as a basketball coach at the high school level.