World sprint champ Roger Pierce is well-known to readers of this blog. He’s been a Masters Hall of Famer for 10 years. But lately I’ve been more intrigued by his W50 wife of three years — Diane Tedford Pierce. On Facebook, I followed her progress in coming back from knee surgery. When someone suggested I interview her, I jumped into action. Her backstory is impressive, too. Diane — who bought a house with Roger and moved to Rowley, about 10 miles north of Essex in 2015 — graciously responded. Masterstrack.com: Where were you born, and where did you grow up?…