Bidding began at $4 million for the Hall of Famer's 25,000-square-foot home in Arizona.

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It took Seattle Mariners pitching great Randy Johnson just three years to record his first no-hitter, on June 2, 1990. It took him five years to sell his Arizona home.

After listing the mansion in 2014 for $25 million, the 6-foot-10 left-hander has sold it at auction for a deeply discounted $7.3 million, according to the Arizona Republic. The bidding, which took place online, began at $4 million.

The Paradise Valley estate spans five acres. There’s a main residence, a two-bedroom guesthouse, a commercial-grade gym, pool and tennis court.

Entered through a stone archway, the 25,000-square-foot Tuscan mansion includes a chef’s kitchen, a wine cellar, a study lounge, two offices and a pet suite. The master suite — one of seven bedrooms and 12 bathrooms — occupies the entire western wing of the home and holds a sitting area, fireplace, private patio and poker room.

Amenities, such as a game room and a billiards room with a wet bar, fill out the eastern wing. A movie theater offers stadium seating and a ticket booth, while a professional recording studio holds a performance stage and an instrument showroom.

The grounds are built for entertaining. In addition to a swimming pool with a water slide, there’s a bathhouse, fire pit and loggia with a wood-burning pizza oven.

Known as the “Big Unit” for his tall stature, Johnson, 55, retired a 10-time All-Star, a five-time Cy Young Award winner and a 2015 Hall of Fame inductee. His 4,875 career strikeouts are second only to Nolan Ryan’s 5,714 Ks.