Saina Nehwal was forced to withdraw from Swiss Open last week and was admitted to hospital for treatment.
Praneeth, currently ranked 22 in the world, had upset Olympic champion Chen Long in the Swiss Open semi final on Saturday.
Last week, Saina Nehwal said she was admitted to a hospital after being diagnosed with acute gastroenteritis with mild pancreatitis.
Saina Nehwal went down 15-21, 19-21 in the 37-minute match against World No.1 Tai Tzu Ying of Taiwan in the quarters of All England Championship.
All England Open: Saina Nehwal knocked out after losing to World No.1 Tai Tzu Ying in straight games.
Saina Nehwal defeated Line Kjaersfeldt 8-21, 21-16, 21-13 in women's singles second round.
Kidambi Srikanth outclassed his French counterpart Brice Leverdez 21-13, 21-11 in straight games.
PV Sindhu would be the biggest draw for India in this premier badminton tournament.
Saina Nehwal used her powerful smashes to telling effect, registering a 21-18 21-15 win against PV Sindhu.
PV Sindhu overcame a challenge from Assam's promising 19-year-old Ashmita Chaliha in the semifinal.
PV Sindhu, who is the top seed, beat Nagpur's rising star Malvika Bansod 21-11, 21-13 to progress into the quarter-finals.
The first day of the Nationals witnessed as many as 250 matches played on 9 different courts.
Badminton stars PV Sindhu and Saina Nehwal both walked the ramp at the Lakme Fashion Week.
Saina Nehwal recently won the Indonesia Masters, her first title in two years.
Marin suffered an injury during the first game of the Indonesia Masters final.
Indonesia Masters Final - Saina Nehwal vs Carolina Marin Highlights: Carolina Marin was leading 10-4 before she got injured.
Saina Nehwal ovecame a stern test against He Bingjiao.