Former junior world number one Shintaro Mochizuki played for Japan in Davis Cup qualifiers ©Getty Images

Former junior world number one Shintaro Mochizuki featured for Japan in the country's comprehensive win against Pakistan in World Group I of the Davis Cup.

The 17-year-old, who won the junior men’s singles crown at Wimbledon in 2019, played in the doubles rubber alongside Sho Shimabukuro at the Pakistan Sports Complex in Islamabad

They came back from a set down to beat Aqeel Khan and Aisam Qureshi 4-6, 6-4, 6-2. 

It turned out to be the only set dropped by Japan during the tie. 

Yosuke Watanuki defeated Khan 6-3, 6-2 in the opening singles match, before Kaichi Uchida won 6-4, 7-6 against Qureshi. 

Yuta Shimizu confirmed Japan's victory by easing past Muzammil Murtaza 6-1, 6-1.

It was a closer affair in the tie between Ukraine and Israel at the Marina Tennis Club in Kiev, with the hosts eventually winning 3-2. 

Illya Marchenko put Ukraine in front after beating Daniel Cukierman 1-6, 6-3, 6-2, before Edan Leshem levelled the tie for Israel by triumphing 6-3, 3-6, 6-2 against Sergiy Stakhovsky. 

Cukierman then partnered with Jonathan Erlich to battle past Stakhovsky and Denys Molchanov 6-4, 4-6, 6-3. 

The scores were brought level once again by Marchenko, who defeated Leshem 6-3, 6-2. 

Stakhovsky was victorious in the decider against Yshai Oliel, winning 6-4, 6-2 to hand Ukraine the tie.

Both Japan and Ukraine will have to wait until September to find out whether they are among the eight highest-ranked teams to progress to the 2022 Davis Cup qualifiers or whether they will compete in an extra knockout round, scheduled to take place in November.

Two matches also took place in World Group II.

Hosts Bulgaria lost 3-1 to Mexico at Sport Hall Sofia.

Dimitar Kuzmanov earned Bulgaria's only win in the opening singles clash, crushing Luis Patiño 6-1, 6-1. 

Gerardo López Villaseñor came back from a set down to beat Adrian Andreev 3-6, 6-1, 6-2, before Hans Hach Verdugo and Miguel Ángel Reyes-Varela gave Mexico the lead with a 6-4, 6-4 victory over Gabriel Donev and Alexandar Lazarov.

López wrapped up the tie by edging past Kuzmanov 7-6, 4-6, 7-6.

Despite missing world number 30 Hubert Hurkacz, Poland recorded a 3-1 win over El Salvador. 

Marcelo Arévalo was El Salvador's solitary winner with a 6-4, 6-2 victory against Wojciech Marek.

Kacper Żuk overcame Arévalo 7-6, 6-1, before Kamil Majchrzak thrashed Lluis Miralles 6-0, 6-0 to give Poland a 2-0 lead.

Łukasz Kubot and Jan Zieliński were comfortable 6-4, 6-2 winners over Arévalo and Miralles in the doubles.

The eight highest-ranked winners of the World Group II ties will automatically progress to the 2022 World Group I playoffs.

The four lowest-ranked teams will take part in an additional knockout tie due to be staged in November, with the two winners progressing to the 2022 World Group I playoffs and the two losers contesting the 2022 World Group II playoffs.

The remaining 20 World Group I and World Group II ties are scheduled for September.