The 37-year-old kept his unbeaten record this week intact against the 15th-ranked Stefanos Tsitsipas.
Martina Hingis, who is married to a former sports physician Harald Leemann, wrote that by her next birthday the couple would become a family of three.
South Africa won by 20 runs after scoring 195 for four but opening batsman Soumya Sarkar went on a ferocious assault at the start of the Bangladesh innings before falling to Phehlukwayo for 47.
Swiss tennis great Martina Hingis announced her "definite" retirement on Thursday, signalling the end of a career which took her from 1990s teenage superstar to doubles world number one some 20 years later.
Martina Hingis and Chan Yung-Jan, who shared a USD 675,000 top prize, made only two unforced errors in the match while the Czech duo made 18.
Despite the loss, it was season's best performance for Sania Mirza at the Majors as she fell in the third rounds of the Australian Open and the Wimbledon while at the French Open she had made a first round exit.
Sania Mirza-Shuai Peng knocked out of the US Open 2017 after losing 4-6, 4-6 to Martina Hingis-Yung-Jan Chan in the women's doubles semi-final.
India's Sania Mirza reached her first Grand Slam semifinal of the 2017 season with Shuai Peng after edging past Timea Babos and Andrea Hlavackova in a close two-set battle at the US Open
Sania and Barbora lost the opening set of their semi-final clash on Saturday before staging a brilliant comeback to script a 6-7 6-1 10-4 against their fifth-seeded opponents.
Leander Paes and Martina Hingis were beaten 3-6 2-6 by the local pair of Sam Groth and Samantha Stosur in a quarterfinal match that lasted 55 minutes.
Leander Paes and Martina Hingis served six aces to their opponents' four and converted all three of the break point opportunities in the second round match at the Rod Laver Arena on Monday.
Sania Mirza and Bethanie Mattek-Sands triumphed 6-2, 6-3 against the second-seeded Russian team of Ekaterina Makarova and Elena Vesnina in the Brisbane International women's doubles final
While Sania Mirza and Rohan Bopanna advanced in the 2016 US Open, Leander Paes failed to progress past the second round in the mixed doubles event
Sania Mirza partnered Barbora Strycova to beat former teammate Martina Hingis and Coco Vandeweghe 7-5, 6-4 in Cincinnati final
It will be Sania Mirza's first match after the Olympics and her split with fellow World No.1 Martina Hingis.
Sania Mirza and Martina Hingis, who began their partnership in March 2015, have ended their 16-month partnership due to a string of recent poor results.
Sania Mirza has split ways with women's doubles partner Martina Hingis with whom she won the 2016 Australian Open
Back in the 1996 Olympics, Martina Hingis lost in the second round of the singles and reached the quarter-finals of doubles with Patty Schnyder.