Machala To Make Challenger Debut The Ecuadorian metropolis of Machala features on the ATP Challenger Tour for the first time in 2020. The fourth-largest city in the South American country and its second-most important port, Machala is an integral centre of commerce and sport. It has been referred to as the Banana Capital of the World, thanks to its thriving banana industry, which plays a big role in the city's economy.