Rafael Nadal, wife Xisca and baby son Rafa go sightseeing on Sydney Harbour

Bundled up in one of the world’s most famous pairs of arms, little Rafa Junior took in the city’s best sights aboard a Sydney Harbour cruise.

Bundled up in one of the world’s most famous pairs of arms — little Rafa Junior took in Sydney’s best sights on Wednesday afternoon.

Tennis superstar Rafael Nadal, wife Xisca and their baby son were spotted heading out on a Sydney Harbour cruise with the protective dad holding on tightly to the newborn.

The father and son dressed in co-ordinated navy and white outfits.

A proud Rafa showed off the baby to friends before jumping on-board.

Team Nadal were spotted heading out on a Harbour Cruise with baby Rafa in tow. Picture: Media-Mode

The tennis superstar shielded his newborn protectively as they boarded. Picture: Media-Mode

The ace player is in town for the United Cup ahead of the Australian Open, with his newborn son making a quiet courtside debut at Sydney Olympic Park last Thursday.

After being defeated by Alex de Minaur on Monday night, Nadal controversially called for the format of the United Cup to be overhauled by organisers.

Dad and bub dressed in nautically appropriate matching navy and white outfits. Picture: Media-Mode

The Spanish star currently holds the most Grand Slam titles in the world and will no doubt aim to add one more to the record — and his little bub may be the lucky charm he needs.

After arriving in Sydney, Nadal spoke of his struggle to “organise his life” after becoming a first-time dad in October 2022.

“The first event I played like a father, without the baby with me, I lost first round. The second event travelling with the baby, I was out in the group stage,” Nadal said.

“In the end I won my last match but I keep improving.”