Tiina Smith is the top-ranked female tennis player over 60 in New England. So when she and her now-husband bought their home in the Boston suburbs, they replaced a rundown tennis court with a U.S. Open-quality court to accommodate her training.

“Sometimes at a public facility, there’s a lot of noise,” said Smith, 63, who once worked on Wall Street and now owns a vintage jewelry business. “I like my own court because it allows me to think about what I’m doing and what I need to practice to get to the next level.”

Now Smith and her husband, Lawrence Rand, are putting their Weston, Mass., house on the market for $16.25 million. They paid $6.25 million for it in 2012, property records show.

Set on 3.75 acres, the house is the most expensive on the market in Weston, an affluent town about 17 miles west of Boston. Originally built in 1994, the house is roughly 13,550 square feet and was designed by architect Thomas Catalano, known for high-end homes in the area. There are seven bedrooms, including a two-bedroom apartment above the garage.

A tennis lover since childhood, Smith played for Harvard University. Now she is a top-ranked player nationally among women over 60, and holds the No. 1 spot in New England in that category, according to the U.S. Tennis Association.

Rand is a founder of the corporate communications and public-affairs counseling firm Kekst & Company and economics professor at Brown University. The couple met on the board of the U.S.T.A. Foundation, the tennis organization’s charitable organization. Smith and Rand, who each have three children from prior marriages, were married at the Weston house in 2013. Previously, Smith lived in another Boston suburb and Rand lived in Rye Brook, N.Y., where he was mayor in the mid-2000s.

The wedding took place on a Monday night just before Christmas to accommodate Smith’s son, a ski racer, who was in between European competitions while qualifying for the Olympics. “I walked down the stairs and married Larry,” Smith said. The main staircase has a round skylight at the top, one of several “architectural treats,” in the house, she said.

The house itself has a butterfly-shaped design, meaning there are two wings off a central area, which includes a rotunda. “When you light that rotunda up at night, it looks amazing,” she said. “It looks like the turret of a castle.”

The formal living room has a reflective ceiling and french doors that open three ways to the outside. “You can have a party and all these doors can be open,” Smith said.

Smith and Rand added two glass rooms to the house: a conservatory and an eating area off the kitchen. “The whole house has a lot of light, which was a key factor in wanting to live there, especially in New England, where we have long winters,” Smith said. They also added a new HVAC system and a powerful generator.

The house is decorated with pops of color, which Smith said reflects her jewelry collection. Her office, wallpapered in pink velvet, has what she described as Romeo and Juliet-style doors, which can be opened to overlook the main entryway. The conservatory and gym have green-and-white striped wallpaper and furniture.

The blue-and-green tennis court is a hard court with a medium pace, Smith said, and it is surrounded by a dark green windscreen so players can see the ball clearly against an even background. She trains with two different ball machines, finding the repetition effective for honing certain shots, she said.

In addition to the tennis court, Smith and Rand made updates to the grounds, planting birch and apple trees and specimen trees like Japanese maple and Kousa dogwoods. They also redid the pool and pool deck.

Smith and Rand are looking to sell because their children are out of the house. “The house is a big undertaking,” Smith said, and they want to “pass it off to somebody who had younger kids and could fill all the bedrooms and enjoy it like we had.”

Smith said they plan to downsize in the area. They recently purchased a home in Vero Beach, Fla., and they also have homes in New York City and Marion, Mass.

In Weston, the median sale price was $2.2 million in May, up 0.7% from the prior year, according to Redfin.