Former world No 3 Milos Raonic got his 2018 off to a roaring start with a 6-1, 7-5 rout of Taro Daniel in the first round of the Delray Beach Open on Tuesday.
Adrian Mannarino sent defending champions France through to the Davis Cup quarter-finals on Sunday after sealing victory over the Netherlands, while Croatia knocked off Canada to follow Spain through.
Top seed Andrey Rublev reached the ATP NextGen semi-finals on Thursday, edging out Canadian shot-maker and third seed Denis Shapovalov 4-1, 3-4 (8/10), 4-3 (7/2), 0-4, 4-3 (7/3).
South Korean Hyeon Chung became the first player to book his ticket to the semi-finals of the Next Gen ATP Finals in Milan on Wednesday.
Roger Federer reached the Basel quarter-finals for the 15th time on Thursday when he steamrolled Frenchman Benoit Paire 6-1, 6-3 as the top seed stepped up his campaign for an eighth Swiss Indoors title.
Canadian rising star Denis Shapovalov fought hard to beat Japan's Yuichi Sugita 4-6, 6-2, 7-6 (7/3) in the first round of the Swiss Indoors on Monday.
Australia's hopes of reaching a first Davis Cup final in 14 years were shattered on Sunday when Belgium fought back from an overnight deficit to win their semi-final 3-2 and set-up a title showdown with neighbours France.
Rafael Nadal was thrilled Monday to learn he would return to world number one for the first time in three years but sorry it came because Roger Federer withdrew from this week's ATP Cincinnati Masters tournament.
Canadian teenager Denis Shapovalov stunned top seeded Rafael Nadal to reach the quarter-finals of the ATP Montreal Masters tournament, spoiling the Spaniard's chances of returning to world No 1.
Jo-Wilfried Tsonga became the latest star to crash out of Queen's Club as the world number 10 was beaten 6-4, 6-4 by Luxembourg's Gilles Muller on Wednesday.