Pros playing two different balls?! Relax, people. That's already happened
Michelle Poedel on Twitter: "We had a few questions about hail size last night, specifically, what's bigger: half dollar or golf ball? Here's a good guide. (p.s. the answer is golf ball) #
Golf Ball Size (full info) - Golf Sidekick
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A golf ball measures 42 mm. A useful size to remember – any lump bigger... | Download Scientific Diagram
Rules Throwback: One Size Didn't Always Fit All
Golf ball - Wikipedia
SPORTS & GAMES :: PRECISION AND ACCURACY SPORTS :: GOLF :: GOLF BALL image - Visual Dictionary Online
What Is The Circumference Of A Golf Ball? Size And Weight Guide – Measuring Stuff