The American tennis ace is mapping out a new career as an interior designer.
The US faces the Czech Republic in the first round from April 26-27.
The world number two said her near-misses initially left her deflated and sick of tennis, but she was now over the pain.
Defending champion Sloane Stephens was sent packing from the Miami Open on Sunday after a 6-3, 6-2 loss to Germany's Tatjana Maria in the third round.
In an exciting back-and-forth rubber lasting three hours 45 minutes, Siniakova held off the 19-year-old Fed Cup debutante to give the Czechs a 3-0 win in the final against a United States team who were the defending champions but were missing their top players.
The 15-year-old American phenom was forced to dig deep to become the youngest player since Anna Kournikova in 1996 to reach the third round
Venus Williams produced a vintage display full of guts and determination to grind out a 7-5, 6-7(3), 7-5 victory over Jelena Ostapenko at the WTA Finals on Tuesday to set up a White Group decider for a semi-finals berth against Garbine Muguruza.
A summary of the first day's play at the US Open.
Sloane Stephens watched January's Australian Open from her couch, a large cast on her left foot rendering her immobile and raising questions in her mind about her ability to bounce back from the injury.
Sania Mirza and Rohan Bopanna sqaundered a set advantage to lose to USA's Venus Williams and Rajiv Ram 6-2, 2-6, 3-10 in the Rio Olympics semi-finals on Saturday.
"I generally don't play with pain, but this is a Grand Slam and I just wanted to win," said the American.\n\n
Images from Day 6 of Wimbledon at the All England Lawn Tennis and Croquet Club in London, on Saturday.
Serena and Venus Williams rolled back the years as they swept through their last four clashes to set up a retro family final at the Australian Open on Thursday, their ninth meeting in a grand slam title-decider.
In the video, which runs over nine minutes and was posted on Ines Ibbou's Instagram page, the world number 620 starts with "Dear Dominic" and goes on to talk about the difficulties she has had to endure and the sacrifices she needed to make in her career.
IMAGES from the matches played at the Miami Masters on Sunday
Maria Sharapova withdrew from the Rogers Cup with a sore left arm on Thursday, putting the five-time grand slam champion's US Open participation in doubt.
South Korean Chung Hyeon managed to hang around against Roger Federer a little longer this time around, but only just, as the Swiss maestro advanced to the semi-finals of the BNP Paribas Open 7-5, 6-1 on Thursday.
Former world number ones Venus Williams and Ana Ivanovic endured a humbling start to the season after the top two seeds were dumped out of the Auckland Classic in the first round by unheralded opponents.
Wimbledon women's champion Garbine Muguruza says she will savour her victory in order to prevent a similar slump in form to the one she suffered after winning the French Open in 2016.
'I think what Venus and her sister have given our sport is absolutely tremendous. The way they've elevated women's tennis is truly inspiring'
As the first day's play got under way, she posted a video clip on Instagram of her pounding backhands on a clay court despite being absent from the tour since winning the Australian Open in January as she is expecting her first child.
'I knew I was the underdog and I was just enjoying it'
IMAGES from the matches played on Day 3 of the Wimbledon Lawn Tennis Championships at All England Lawn Tennis and Croquet Club on Wednesday
Venus Williams crushed Frenchwoman Alize Cornet 6-3, 6-0 in the final of the Dubai Championship on Saturday, the veteran American bagging her first singles title since 2012.
She will now play Dutch 15th seed Kiki Bertens, who saw off Australian qualifier Daria Gavrilova 6-3, 6-3, in Saturday's semi-final on the red Foro Italico clay.
PHOTOS from day seven of the Wimbledon championships at the All England Lawn Tennis and Croquet Club in London on Monday
Serena Williams will try to take a step closer to history on Saturday when she plays her third-round match at the US Open.
Vogue magazine, who were given exclusive rights to the photographs of the 'wedding of the year', put out some pictures from the Beauty and the Beast-themed wedding on their Instagram page.
Check out the gold medallists from Day 9
After stunning Venus Williams then saving two match points en route to beating Polona Hercog last week, Gauff was suddenly the hottest ticket in town but she was always going to find it tough against Halep, last year's French Open champion and the first top-10 opponent she had ever faced.
Images from Day 7 of the 2021 Wimbledon at the All England Lawn Tennis and Croquet Club, in London, on Monday.
With next week's Australian Open in mind, a weary Venus Williams has opted to skip the Hobart International while her American compatriot Sloane Stephens has pulled out of the Sydney International with a minor wrist injury.
Serbia's Ana Ivanovic overcame a second set resistance to beat Belgium's Kirsten Flipkens on Friday and set up an Auckland Classic final against former World No 1 Venus Williams.
Images from Day 2 of the Wimbledon tennis championships in London, on Tuesday.
Serena Williams beat her sister Venus 6-4, 6-4 in the Australian Open final on Saturday to win her 23rd grand slam singles title and become the most successful tennis player in the open era.
Venus Williams staged a spirited comeback to down third seed Petra Kvitova 4-6, 7-5, 6-4 and reach the third round of the BNP Paribas Open in Indian Wells on Saturday.