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Wheelchair racer Andrew Small blitzed his rivals in the men’s T33 100m final while Phoebe Paterson Pine triumphed in the archery on her Paralympics debut.
Pearson completed a hat-trick of podium-topping performances in Japan by scoring 82.447 with his home-bred horse Breezer to win the individual freestyle test (grade II).
The 47-year-old once again edged Austrian rival Pepo Puch into silver, while GB rider Georgia Wilson collected the second bronze of her debut Games with 76.754 on Sakura.
Pearson, Britain's third most successful Paralympian, told Channel 4: “I am so proud of my horse. He was like a baby lion in that arena. I didn’t care if I didn’t medal but I’m very pleased that I did and I’m please it was gold. My horse gave me everything.”
At Tokyo’s National Stadium, Small powered to victory in a time of 17.73 seconds after flying out of the blocks.
The blistering start proved crucial as defending champion Ahmad Almutairi of Kuwait threatened to snatch victory by closing the sizeable gap, only to cross the line a tenth of a second behind.
Small’s success was an upgrade on the bronze he won behind Almutairi at Rio 2016, with third place on the podium on this occasion going to his GB team-mate Harri Jenkins in a season’s best 18.55secs.
"I entered the race, I don’t ever expect outcomes, I just go and do it and see what happens and hey ho this is where we got," the 28-year-old told Channel 4.
"I normally have a Garfield brought to me where ‘I hate Mondays’, so I may have to change that now."
Meanwhile, Paterson Pine struck after she won the battle of the Brits by beating defending champion Jess Stretton en route to glory.
Games debutant Paterson Pine began a memorable day with a tense 141-140 success over her world No1 compatriot in the second round of the women’s individual compound.
The 23-year-old, who has spina bifida, later took Stretton’s crown with a 134-133 win over Chile’s Mariana Zuniga Varela in the decisive contest, having also beaten France’s Julie Chupin and Italian Maria Andrea Virgilio in the quarter-finals and semi-finals respectively.
She said: "I still almost feel I’m living in a dream and it won’t settle until I’m with family or looking at the aftermath on my phone."