On Sunday, the Bulls were also playing without guard Richard Hamilton, who didn't travel because of a lower back injury, and forward Taj Gibson, who sat out with a left knee injury.

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Santana went 6-9 with a 4.85 ERA and 111 strikeouts over 117 innings and 21 starts last year before an ankle injury and lower back inflammation ended his season in August.

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After throwing 134 pitches in the no-hitter, the 33-year-old left-hander was 3-7 with an 8.27 ERA. He went on the disabled list in late July due to an ankle injury, had lower back inflammation when he returned and made his last start Aug. 17.

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Mr Davidson said he "felt a twinge in my lower back" under the strain and suffered a back injury that ended his career as a man of action.

BBC: Spine

The next day he was operated on for a 10cm (4in) deep "laceration" to his lower back but neither he nor hospital staff know how the injury occurred.

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The pain in the lower left of his back has caused Murray discomfort since late 2011 and is the same injury which required a painkilling injection at last year's French Open.

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After Granollers won the first set 6-3, Murray took a long injury break early in the second set, getting his left thigh and lower back massaged.

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Jenn Suhr has recently been plagued by one nagging ailment after another, dealing with an Achilles injury, a gluten allergy that has caused sometime-debilitating sickness and lower back problems.

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Sudden lower back pain years after epidural or spinal anesthesia is more likely to be caused by a recent injury, heavy lifting, poor posture or positioning (such as during sleep or while carrying a backpack), or stress on the bones or muscles.

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